Recrecimiento tumoral en pacientes bajo esquema de watch-and-wait en cáncer de recto. Ensayo pictórico / Regrowth during watch-and-wait scheme in rectal cancer. Pictorial essay

Resumen En las últimas décadas, la resonancia magnética (RM) ha cobrado un rol fundamental en el diagnóstico, la estadificación y el seguimiento de los pacientes con cáncer de recto. En la estadificación inicial, que sean o no tumores localmente avanzados es lo que determina el tratamiento neoadyuvante o quirúrgico, respectivamente. Posterior a la neoadyuvancia, los pacientes que logren una respuesta clínica completa pueden ser considerados para la inclusión dentro de un esquema de vigilancia activa, comúnmente conocido como watch and wait (WW). La estrategia WW se basa en tres pilares, que son el examen digital rectal, la endoscopía y la RM, buscando detectar la presencia temprana de recrecimiento tumoral. En relación a la RM, la secuencia potenciada en T2 de alta resolución, junto con la de difusión (DWI) y el mapa de ADC, son las piezas clave para la detección temprana de recrecimiento. La estrategia de WW lleva a evitar cirugías resectivas con una alta morbilidad y deterioro de la calidad de vida. El examen digital rectal y la endoscopía son métodos de vigilancia complementarios a la RM, con su principal limitación en lesiones sin compromiso mucoso. Esta razón posiciona a la RM como un pilar indispensable para su implementación, detectando no solo áreas de recrecimiento parietal, sino también aquellas extramurales no accesibles por los otros métodos de vigilancia. En nuestro conocimiento, este es el primer ensayo iconográfico que se centra en el análisis estricto del recrecimiento tumoral en pacientes bajo esquema de WW por RM. El objetivo es enfatizar el protocolo de estudio en estos pacientes y mostrar las distintas formas de recrecimiento tumoral con el fin de lograr su detección temprana.

Abstract During the last decades, the magnetic resonance imaging (MRI) has become an strategic tool for diagnosis, staging and surveillance in patients with rectal cancer. To differentiate patients with locally advanced rectal tumors from those who do not, determinate neoadjuvant therapy or total mesorectal excision, respectively. After neoadjuvant chemoradiotherapy, those who achieve complete clinical response may be considered for inclusion in an active surveillance scheme known as “watch and wait” (WW). WW strategy consists of three pillars, rectal digital exam, endoscopy and the MRI, and the main purpose is to reach the early detection of tumoral regrowth. Regarding MRI, the high-resolution T2-weighted images in conjunction with DWI, and the ADC map plays a key role in this instance. WW leads to avoid resective surgeries with high morbidity rates. The rectal digital exam and endoscopy are complementaries to MRI, whose main limitation is the detection of lesions with no mucosal involvement. This reason places the MRI as a cornerstone in tumoral regrowth, detecting not only luminal regrowth, but those in which the rectal wall is not involved, and thus, not accessible for the other surveillance methods. To our knowledge, this is the first pictorial essay in which imaging regrowth patterns are described. The purpose of this is to emphasize the MRI protocol study and to describe the different forms of tumoral regrowth in order to reach the early tumoral regrowth detection.

Fístula enterocutánea: un enfoque desde las generalidades y el estado nutricional / Enterocutaneous fistula: An approach based on generalities and nutritional status

Introducción. Una fístula es una conexión anormal entre dos superficies epitelizadas. Cerca del 80 % de las fístulas entero-cutáneas son de origen iatrogénico secundarias a cirugía, y un menor porcentaje se relacionan con traumatismos, malignidad, enfermedad inflamatoria intestinal o isquemia. La morbilidad y las complicaciones asociadas pueden ser significativas, como la desnutrición, en la que intervienen múltiples factores. Métodos. Se realizó una búsqueda de la literatura en las bases de datos de PubMed, Google Scholar y SciELO, utilizando las palabras claves descritas y se seleccionaron los artículos más relevantes de los últimos años. Resultados. La clasificación de las fístulas se basa en su anatomía, su gasto o secreción diaria y su localización. Existe una tríada clásica de las complicaciones: sepsis, desnutrición y anomalías electrolíticas. El control del gasto de la fístula, el drenaje adecuado de las colecciones y la terapia antibiótica son claves en el manejo precoz de estos pacientes. Los estudios recientes hacen hincapié en que la sepsis asociada con la desnutrición son las principales causas de mortalidad. Conclusiones. Esta condición representa una de las complicaciones de más difícil y prolongado tratamiento en cirugía abdominal y colorrectal, y se relaciona con importantes tasas de morbilidad, mortalidad y altos costos para el sistema de salud. Es necesario un tratamiento multidisciplinario basado en la reanimación con líquidos, el control de la sepsis, el soporte nutricional y el cuidado de la herida, entre otros factores.

Introduction. A fistula is an abnormal connection between two epithelialized surfaces. About 80% of enterocutaneous fistulas are of iatrogenic origin secondary to surgery, and a smaller percentage are related to trauma, malignancy, inflammatory bowel disease or ischemia. The associated morbidity and complications can be significant, such as malnutrition, in which multiple factors intervene. Methods. A literature search was carried out in the PubMed, Google Scholar and SciELO databases using the keywords described and the most relevant articles from recent years were selected. Results. The classification of fistulas is based on their anatomy, their daily secretion output, and their location. There is a classic triad of complications: sepsis, malnutrition and electrolyte abnormalities. Control of fistula output, adequate drainage of the collections and antibiotic therapy are key to the early management of these patients. Recent studies emphasize that sepsis associated with malnutrition are the main causes of mortality. Conclusions. This condition represents one of the most difficult and prolonged complications to treat in abdominal and colorectal surgery, and is related to significant rates of morbidity, mortality and high costs for the health system. Multidisciplinary treatment based on fluid resuscitation, sepsis control, nutritional support, and wound care, among other factors, is necessary.

Log odds of positive nodes as a prognostic factor for rectal cancer: a retrospective study

SUMMARY OBJECTIVE: Rectal cancer is an important cause of mortality and morbidity globally. The aim of this study was to investigate whether the log odds of positive nodes system is a better indicator than tumor node metastasis and lymph node ratio systems to determine rectum cancer prognosis, which is an important cause of mortality and morbidity globally. METHODS: This was a single-center retrospective cross-sectional study. Data were obtained from the medical records of patients with rectum adenocarcinoma followed at Gazi University Hospital. The clinicopathological data of 128 patients with rectum adenocarcinoma who underwent low anterior resection or abdominoperineal resection between January 2010 and December 2018 was retrospectively reviewed. Patients with rectum adenocarcinoma as the first and only primary diagnosis, which was confirmed by histopathological examination, than those who had undergone complete curative resection via low anterior resection or abdominoperineal resection were included. Those with familial adenomatous polyposis or Lynch syndrome, those under 18 years of age, with a synchronous tumor, peritoneal spread, or metastatic disease at the time of diagnosis, and those with <12 lymph nodes dissected from the resection material were excluded from the study. RESULTS: In multivariate analysis, age, perineural invasion, tumor node metastasis stage, lymph node ratio stage, and log odds of positive nodes stage were found to be independent prognostic factors (p<0.05). LODDS2 patients' mortality rates were 9.495 times higher than LODDS0 patients [hazard ratio=9.495, (95%CI 4.155-21.694), p<0.001] while LNR2 stage patients' mortality rates were 7.016 times higher than LNR0 stage patients [hazard ratio=7.016, (95%CI 3.123-15.765), p<0.001] and N2 stage patients had a 5.135 times higher risk of mortality than those who were in N0 stage [hazard ratio=5.135 (95%CI 2.451-10.756), p<0.001]. CONCLUSION: Log odds of positive nodes is a more valuable prognostic factor for rectal cancer patients than tumor node metastasis and lymph node ratio systems to determine rectum cancer prognosis.

Intervención educativa sobre el examen y autoexamen de próstata en pacientes mayores de 45 años / Educational Intervention on Prostate Examination and Self-Examination in Patients older than 45

Introducción: El examen físico mediante el tacto rectal es una manera de encontrar temprano el cáncer de próstata. Aunque este resulta de suma importancia en las pesquisas, tiene poca aceptación debido a los tabúes arraigados en la sociedad. Por tanto, es necesario educar a la población masculina. Objetivo: Elevar el nivel de conocimientos sobre el examen y autoexamen de próstata en pacientes mayores de 45 años. Métodos: Se realizó un estudio cuasiexperimental de intervención educativa en un universo constituido por 62 pacientes mayores de 45 años pertenecientes al Policlínico Docente Área Este, de la ciudad de Camagüey. La muestra quedó conformada por 55 pacientes que cumplieron con los criterios de selección del estudio. Se analizaron las variables grupo de edades, nivel educacional; así como los conocimientos sobre las características generales del cáncer de próstata, prevención y control de los factores de riesgo, examen y autoexamen de próstata, antes y después de aplicada la intervención educativa. Resultados: En la muestra analizada predominaron los pacientes de entre 45-49 años (30,9 por ciento) y el nivel educacional técnico medio (43,6 por ciento), mientras se logró elevar el conocimiento en relación a las características generales del cáncer de próstata (40,0/94,6 por ciento), prevención y control de los factores de riesgo (20,0/92,7 por ciento), y de 7,3/87,3 por ciento en lo concerniente al examen y autoexamen de próstata. Conclusiones: Se alcanzaron valores estadísticamente significativos, de manera que se logró elevar el nivel de conocimientos en la muestra estudiada(AU)

Introduction: Examination by digital rectal examination is a way to early find prostate cancer. Although this examination is utmost important in the investigations, it has little acceptance due to the taboos rooted in society. In this sense, it is necessary to educate the male population. Objective: To raise the level of knowledge about prostate examination and self-examination in patients older than 45 years of age. Methods: A quasi-experimental study of educational intervention was carried out in a universe consisting of 62 patients older than 45 years of age from Área Este Teaching Polyclinic, in the city of Camagüey. The sample was made up of 55 patients who met the study selection criteria. The variables were analyzed age group, educational level; as well as knowledge about the general characteristics of prostate cancer, prevention and control of risk factors, prostate examination and self-examination before and after the educational intervention is applied. Results: In the studied sample, patients between 45-49 years of age (30.9percent) and the average technical educational level (43.6percent) predominated, while knowledge was raised in relation to the general characteristics of prostate cancer (40.0/94.6percent), prevention and control of risk factors (20.0/92.7percent), and 7.3/87.3percent regarding prostate examination and self-examination. Conclusions: Statistically significant values were reached, so that the level of knowledge was raised in the sample studied(AU)

Primary Anorectal Melanoma: Case Report and Review of a Rare Neoplasm

Primary anorectal melanoma is a rare malignant melanocytic neoplasm; its principal manifestation is rectal bleeding. It has an ominous prognosis with a five-year survival rate of 10%. The case of a 56-year-old woman with rectal bleeding and the sensation of a rectal mass is presented. A polypoid lesion, resected transanally, was documented in the distal rectum during the colonoscopy. The histological study confirmed a primary anorectal melanoma.

El melanoma anorrectal primario es una neoplasia melanocítica maligna poco frecuente, su principal manifestación es el sangrado rectal. Tiene un pronóstico ominoso con una tasa de sobrevida del 10% a 5 años. Se presenta el caso de una mujer de 56 años con rectorragia y sensación de masa rectal. Durante la colonoscopia se documentó una lesión polipoide en el recto distal, que se resecó por vía transanal. El estudio histológico confirmó la presencia de un melanoma anorrectal primario.

La escisión total del mesorrecto transanal en el tratamiento del cáncer del recto como nueva técnica en Cuba

Introducción: Las indicaciones de la Microcirugía Transanal Endoscópica han evolucionado desde la cirugía de tumoraciones rectales hasta otras enfermedades pélvicas. La asociación de esta y la escisión total del mesorrecto transanal ofrece una serie de ventajas. Objetivo: Determinar las indicaciones, describir la técnica quirúrgica y mostrar los resultados a largo plazo obtenidos en la realización de la escisión total del mesorrecto transanal en el tratamiento del cáncer del recto medio y bajo. Métodos: Se realizó un estudio observacional descriptivo y prospectivo de los pacientes con cáncer del recto medio y bajo sometidos a esta técnica quirúrgica en el período comprendido entre febrero de 2017 y febrero de 2022 en el Centro Nacional de Cirugía de Mínimo Acceso. Resultados: Se operaron 13 pacientes, 9 con cáncer del recto bajo y 4 con cáncer del recto medio y un promedio de edad de 56,2 años (rango 28-76). El promedio de tiempo quirúrgico fue de 183 minutos (rango 120-270) y las pérdidas hemáticas estimadas de 68 mililitros. La incidencia de morbilidad mayor fue de 15,4 % y la media de estadía hospitalaria de 5,4 días. La media del período de seguimiento fue de 35 (rango 9-69) meses con una recidiva local de 7,7 % y una supervivencia global a los 5 años de 100 %. Conclusiones: La escisión total del mesorrecto transanal combinado con cirugía laparoscópica es una técnica factible y segura. La introducción de la variante técnica utilizando el instrumental de la Microcirugía Transanal Endoscópica es más ergonómica y disminuye los costos.

Introduction: The indications for transanal endoscopic microsurgery have evolved from surgery of rectal tumors to other pelvic diseases. The association between this and total excision of the transanal mesorectum offers a series of advantages. Objective: To determine the indications, to describe the surgical technique and to show the long-term outcomes obtained in the performance of total excision of the transanal mesorectum for treating cancer of the middle and lower rectum. Methods: A descriptive and prospective observational study was carried out of patients with cancer of the middle and lower rectum who underwent this surgical technique in the period from February 2017 to February 2022 at Centro Nacional de Cirugía de Mínimo Acceso. Results: Thirteen patients were operated on, 9 with cancer of the lower rectum and 4 with cancer of the middle rectum, as well as an average age of 56.2 years (range 28-76). The average surgical time was 183 minutes (range 120-270) and estimated blood loss was 68 milliliters. The incidence of highest morbidity was 15.4 % and mean hospital stay was 5.4 days. The median follow-up period was 35 (range 9-69) months, with a local recurrence of 7.7 % and an overall 5-year survival of 100 %. Conclusions: Total excision of the transanal mesorectum combined with laparoscopic surgery is a feasible and safe technique. The introduction of the variant technique using the instruments of endoscopic transanal microsurgery is more ergonomic and reduces costs.

Microcirugía transanal endoscópica en el tratamiento para el cáncer del recto

Introducción: La microcirugía transanal endoscópica es un procedimiento mínimamente invasivo que se aplica para el tratamiento local del cáncer del recto en estadios iniciales. Su utilización en estadios más avanzados del cáncer del recto resulta controversial. Sin embargo, con el uso rutinario del tratamiento neoadyuvante constituye una opción atractiva que se ha comenzado a considerar. Objetivo: Evaluar los resultados de la microcirugía transanal endoscópica para el tratamiento del cáncer del recto en el Centro Nacional de Cirugía de Mínimo Acceso. Métodos: Se realizó un estudio retrospectivo de una base de datos prospectiva de 18 años. La muestra fue de 150 pacientes que cumplieron con los criterios de selección y las variables estudiadas fueron: edad, sexo, indicación, tiempo quirúrgico, entre otras. Resultados: La principal indicación fue el adenocarcinoma del recto T1. La edad media fue 63 años (32-93); el tiempo quirúrgico, 76 minutos (25-240) y el tamaño tumoral, 2,8 cm (1-4). La estancia hospitalaria fue de 1 día (12 horas-7 días), la morbilidad fue 6,7 % y las principales complicaciones posoperatorias fueron el sangramiento, la dehiscencia de sutura, el absceso, la fístula rectovaginal y la estenosis. La recurrencia local fue 8,2 %, 7,1 % y 2,5 % para los adenocarcinomas T1, T2 y T3 respectivamente. La supervivencia global a los 5 años fue 97,5 % y la supervivencia libre de enfermedad fue 95,5 %. Conclusión: La microcirugía transanal endoscópica es una técnica factible y segura en el tratamiento de los adenocarcinomas T1, mientras que en los T2 y T3 se requiere de la radioquimioterapia preoperatoria.

Introduction: Transanal endoscopic microsurgery is a minimally invasive procedure applied for the local treatment of rectal cancer at early stages. Its use in more advanced stages of rectal cancer is controversial. However, with the routine use of neoadjuvant treatment, it is an attractive option that has begun to be considered. Objective: To assess the outcomes of transanal endoscopic microsurgery for the treatment of rectal cancer at Centro Nacional de Cirugía de Mínimo Acceso. Methods: A retrospective study of an 18-year prospective database was performed. The sample consisted of 150 patients who met the selection criteria and the variables studied were age, sex, indication, surgical time, among others. Results: The main indication was T1 rectal adenocarcinoma. The mean age was 63 years (32-93); surgical time, 76 minutes (25-240); and tumor size, 2.8 cm (1-4). Hospital stay was 1 day (12 hours-7 days), morbidity was 6.7 %, and the main postoperative complications were bleeding, suture dehiscence, abscess, rectovaginal fistula and stenosis. Local recurrence was 8.2 %, 7.1 % and 2.5 % for T1, T2 and T3 adenocarcinomas, respectively. Overall survival at 5 years was 97.5 % and disease-free survival was 95.5 %. Conclusion: Transanal endoscopic microsurgery is a feasible and safe technique for treating T1 adenocarcinomas, while T2 and T3 adenocarcinomas require preoperative radiochemotherapy.

Rectopexia laparoscópica con técnica de Orr-Loygue para el tratamiento del prolapso rectal / Laparoscopic Orr-Loygue rectopexy with mesh for the treatment of rectal prolapse

Introducción: Existen múltiples alternativas para el tratamiento quirúrgico del prolapso rectal mediante procedimientos de fijación, resección o combinados. Si bien el abordaje perineal evita el acceso a la cavidad peritoneal, se acompaña de una tasa de recidiva mayor en relación al abordaje abdominal. Descripción: Se presenta una paciente de 66 años, histerectomizada por vía laparotómica, con un prolapso rectal externo y reductible de 1 año de evolución, sin incontinencia fecal ni constipación. La endoscopia preoperatoria descartó patología colónica asociada. Abordaje laparoscópico en posición de Trendelenburg lateralizado a la derecha. Como es habitual en estos casos se observa la presencia de dolicosigma y fondo de saco de Douglas profundo y se evidencia también la cicatriz de la cesárea. El procedimiento comienza con la apertura peritoneal a nivel del promontorio y la movilización de la unión rectosigmoidea, identificando el uréter izquierdo. Se continua la disección circunferencial tras la apertura de la reflexión peritoneal hasta la altura de la cúpula vaginal. La rectopexia se realiza según la técnica de Orr-Loygue mediante la fijación de la malla por una parte a ambas caras laterales del recto y por otra al promontorio sacro con puntos de polipropileno 2-0, cuidando de no lesionar los vasos ilíacos y los uréteres. Finalmente se cierra la reflexión peritoneal con poliglactina para aislar las mallas protésicas del contenido visceral. La paciente tuvo una buena evolución postoperatoria, otorgándose el alta a las 48 h. Tras 8 meses de seguimiento se encuentra asintomática, con tránsito digestivo y continencia fecal sin alteraciones. Conclusión: El abordaje laparoscópico para el tratamiento del prolapso rectal es seguro y ofrece las ventajas de la cirugía mini-invasiva. La rectopexia con malla protésica es un procedimiento técnicamente desafiante, aunque con mejores resultados alejados. (AU)

Introduction: There are multiple alternatives for the surgical treatment of rectal prolapse through fixation, resection or combined procedures. Although the perineal approach avoids access to the peritoneal cavity, it is associated with a higher recurrence rate than the abdominal approach. Description: The video shows a 66-year-old female patient, hysterectomized by laparotomy, with a 1-year history of reduciblefull-thickness rectal prolapse, without fecal incontinence or constipation. Preoperative endoscopy ruled out associated colonic pathology. The laparoscopic approach is done with the patient placed in Trendelenburg and tilted to the right. As usual in these cases, the presence of dolichosigma and deep Douglas pouch is observed, as well as the cesarean section scar. The procedure begins with the peritoneal opening at the level of the promontory and the mobilization of the rectosigmoid junction, identifying the left ureter. Circumferential dissection is continued after opening the peritoneal reflection up to the level of the vaginal vault. Rectopexy is performed according to the Orr-Loygue technique by fixing the mesh to both lateral aspects of the rectum on one side and to the sacral promontory on the other side with 2-0 polypropylene interrupted sutures, taking care not to injure the iliac vessels and ureters. Finally, the peritoneum is closed with a running suture with polyglactin to isolate the prosthetic mesh from the visceral content. The patient had a good postoperative outcome and was discharged at 48 h. After 8 months of follow-up, she is asymptomatic and has normal colonic transit and fecal continence. Conclusion: the laparoscopic approach for the treatment of rectal prolapse is safe and offers the advantages of minimally invasive surgery. Prosthetic mesh rectopexy is a technically challenging procedure, although has better distant results. (AU)

Prolapso rectal completo / Complete Rectal Prolapse

Introducción: El prolapso rectal completo es la invaginación de las capas del recto a través del canal anal y su protrusión fuera de este. Su incidencia es de 2,5 por 100 000 habitantes con predominio en mujeres de edad avanzada. Es una afección de curso crónico y benigno, cuya presentación clínica y endoscópica es tan variable que puede confundirse con otras entidades como con el cáncer colorrectal. Objetivo: Presentar el caso de una paciente femenina, operada de prolapso rectal completo en la provincia de Cienfuegos. Presentación de caso: Se presenta una paciente femenina de 76 años de edad, blanca, de procedencia rural que acude a la consulta y refiere que lleva 12 días sin defecar. Además, presenta dolor, sangramiento rectal no activo y una masa que protruía a través de la región anal sugestiva al examen físico de un prolapso rectal completo. El tacto rectal confirma el diagnóstico. Se realiza reducción quirúrgica del prolapso por técnica de Delorme. Actualmente lleva 6 meses de operada con evolución favorable. Por lo poco frecuente de esta entidad se considera de interés científico su publicación. Conclusión: Esta entidad es poco común en el entorno médico, el gran cambio que causa en el nivel de vida de aquellos que la portan y sus complicaciones hace que requiera un tratamiento rápido y oportuno(AU)

Introduction: Complete rectal prolapse is the invagination of the rectal layers through the anal canal and its protrusion out of it. Its incidence is 2.5 per 100,000 inhabitants, predominantly in elderly women. It is a chronic and benign condition, whose clinical and endoscopic presentation is so variable that it can be confused with other entities, such as colorectal cancer. Objective: To present the case of a female patient who underwent surgery for complete rectal prolapse in the province of Cienfuegos. Case presentation: A 76-year-old female patient, white, from a rural area, came to the clinic and reported that she had not defecated for 12 days. In addition, she presents pain, nonactive rectal bleeding and a mass protruding through the anal region suggestive, on physical examination, of a complete rectal prolapse. Digital rectal examination confirmed the diagnosis. Surgical reduction of the prolapse was performed using the Delorme technique. She has undergone surgery for 6 months now, with favorable evolution. Due to the rarity of this entity, its publication is considered as scientifically interesting. Conclusion: This entity is uncommon in the medical environment. The great change that it causes in the living standards of those who carry it and its complications make it require a quick and timely treatment(AU)

Evaluation of the response rate to neoadjuvant chemoradiotherapy in patients with rectal adenocarcinoma: a retrospective long-term study in two terciary reference centers

Objectives: To evaluate the complete response (CR) rate and surgeries performed in patients with rectal adenocarcinoma who underwent neoadjuvant therapy (NT) at Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo and at Hospital São Paulo, in Ribeirão Preto, from January 2007 to December 2017. Methods: We evaluated 166 medical records of patients with locally advanced rectal adenocarcinoma (T3, T4 or N+) who underwent NT. The regimen consisted of performing conventional (2D) or conformational (three-dimensional-3D/ radiotherapy with modulated intensity - IMRT) at a dose of 45-50.4Gy associated with capecitabine 1650mg/m2 or 5-fluorouracil (5FU) and leucovorin (LV). The following variables were analyzed: gender, age, pretreatment stage, radiotherapy, CR index, local and distant recurrence rates. Surgical treatment and complications were also evaluated. Results: The CR index was 28.3%. Patients treated with 3D/IMRT radiotherapy had a higher rate of CR (36.3% x 4.8%; p < 0.001), higher rates of clinical follow-up (21% x 0%; p < 0.001), lower surgery rates (79% x 100%; p < 0.001), higher rates of transanal resection (37.1% x 9.5%; p = 0.001), lower rates of abdominal rectosigmoidectomy (25.8% x 50%; p = 0.007) and lower rates of abdominoperineal resection of the rectum (16.1% x 40.5%; p = 0.002), when compared to patients treated with 2D radiotherapy. Conclusion Modern radiotherapy techniques such as 3D conformal and IMRT, by offering greater adequacy and precision of treatment, could result in better local control and less toxicity in organs at risk, enabling organ preservation strategies and less invasive approaches in selected cases. (AU)

Temporary stomas after rectal cancer resection; predilection of being permanent and predictors of complications?

Stomas are essential for colorectal surgery and are widely used not only for selected cases for bowel obstructions but also in rectal cancer operations to divert stool away from low rectal anastomosis. On the other hand, complications with stomas/ stomas reversal are not uncommon. In this study, we aimed at studying the frequency and the predictors of temporary stomas being permanent, and the contributing factors of surgical stoma/stoma closure related complications. In our cohort, only about 40% of the patient closed their initially planned temporary stomas. The occurrence of intestinal leak, wound sepsis, or any type of morbidity with 30 days of operation were significant predictors of permanent stomas. In addition, alarmingly although Hartmann's procedure was uncommon in our practice, only 9% of those who underwent Hartmann's have had it reversed. Moreover, the only factor that significantly increased stoma related complications was having an end colostomy. There was a tendency toward late closure of stomas with median 8.2 months, however early closure did not correlate to complications. In conclusion, further studies are needed to delineate the low rate of stoma closure. Patients who develop postoperative complications, even wound sepsis, would be at a higher risk of living with permanent stomas. Hartmann's procedures are commonly associated with stoma problems, and reluctance to reverse the stomas. (AU)

McKittrick Wheelock syndrome secondary to adenocarcinoma of the rectum: case report and diagnostic considerations

Introduction: McKittrick-Wheelock syndrome is a rare entity characterized by chronic diarrhea, acute kidney injury, and hydroelectrolytic imbalance associated with a large rectal tumor, frequently a villous adenoma. Case report: A 69-year-old male with chronic diarrhea with mucus. He underwent a colonoscopy with biopsies, reporting adenocarcinoma of the rectum in situ, and underwent a robot assisted intersphincteric resection with colo-anal anastomosis and a protecitive ileostomy. Discussion: Described in 1954, this syndrome is manifested by electrolyte imbalance and acute renal injury secondary to diarrhea associated with a rectal villous adenoma, often with long lasting symptoms. The most frequent symptom being watery diarrhea with mucus. The definitive treatment consists of surgical resection. Conclusion: Although this is a rare pathology, it should be considered as a differential diagnosis in cases of chronic diarrhea associated with water and electrolyte disorders. (AU)

Radioquimioterapia neoadyuvante en cáncer de recto: Relevancia clínica del downstaging y la respuesta patológica completa

Antecedentes: La radioquimioterapia neoadyuvante es uno de los pilares del tratamiento del cáncer de recto localmente avanzado. La neoadyuvancia ha demostrado disminuir la recidiva local, generando también un downstaging tumoral, llegando incluso a una respuesta patológica completa (RPC), esta última relacionada con una mejor sobrevida global (SG) y sobrevida libre de enfermedad (SLE). Objetivo: Reportar los resultados anátomo-patológicos del tratamiento con radioquimioterapia en cáncer de recto, analizando su relación con la SG y la SLE. Material y Método: Estudio de cohorte prospectivo. Se analiza base de datos de cirugías coloproctológicas del Hospital Clínico de la Universidad de Chile, entre los años 20042019, incluyendo pacientes con cáncer de recto medio y bajo localmente avanzados, los cuales recibieron neoadyuvancia y posteriormente cirugía. Se realizó el análisis de sobrevida con el método de Kaplan-Meier y el test Log-rank para su comparación. Se consideró estadísticamente significativo un valor de p < 0,05. Resultados: 411 pacientes fueron operados por cáncer de recto, 143 pacientes recibieron neoadyuvancia, el 19% registró RPC. La SG del grupo con RPC fue 94% (IC 95%; 59,79-79,41%) mientras que la del grupo sin RPC fue 71% (IC 95%; 66,64-99,20%) (p = 0,018), la SLE en aquellos pacientes con RPC alcanzó un 100%, mientras que en aquellos sin RPC fue 74% (IC 95%; 64,08-81,28) (p = 0,008). Conclusiones: Los pacientes con RPC mostraron mejores resultados a largo plazo que aquellos sin RPC. La RPC podría indicar un perfil tumoral biológico favorable, con menos tendencia a la recurrencia y mejor supervivencia.

Background: One of the mainstays in the treatment of locally advanced rectal cancer is neoadjuvant chemoradiotherapy. Neoadjuvant therapy have demonstrated to decrease local recurrence, also generating tumor downstaging, even leading to a pathological complete response (PCR), the latter related to better overall survival (OS) and disease-free survival (SLE). Aim: To report the anatomo-pathological results of treatment with chemoradiotherapy in rectal cancer, analyzing the relationship with OS and SLE. Material and Method: Prospective cohort study. A database of colorectal surgeries from the Clinical Hospital of the University of Chile between the years 2004-2019, including patients with locally advanced low and middle rectal cancer, who received neoadjuvant and later surgery. Survival analysis was made with the Kaplan-Meier method and the Log-rank test for comparison. A value of p < 0.05 was considered statistically significant. Results: 411 patients underwent surgery for rectal cancer, 143 patients received neoadjuvant therapy, 19% registered PCR. The OS of the group with PCR was 94% (95% CI; 59.79-79.41%) while that of the group without PCR was 71% (95% CI; 66.64-99.20%) (p = 0.018), the SLE in those patients with PCR reached 100%, while in those without PCR it was 74% (95% CI; 64.08-81.28) (p = 0.008). Conclusions: Patients with PCR have better long-term results than those without PCR. PCR could indicate a favorable biological tumor profile, with less tendency to recurrence and improved survival.

The role of MRI and 18F-FDG PET/CT with respect to evaluation of pathological response in the rectal cancer patients after neoadjuvant chemoradiotherapy

Background: We aimed to evaluate the role of magnetic resonance imaging (MRI) and 18F-fluorodeoxyglucose (FDG) positron emission tomography朿omputed tomography (PET-CT) in determining the correct stage and predicting the pathological response. Methods: Seventy one patients with pathologic proven rectal adenocarcinoma, clinical stage IIA-IVA, and neoadjuvant chemoradiotherapy (CRT) were evaluated retrospectively. Radiotherapy was delivered 45� Gy in 25 fractions with concomitant oral capecitabine. Pelvic MRI, colonoscopy, and 18F-FDG PET-CT were performed before the neoadjuvant treatment (NAT). After NAT, MRI and PET-CT were performed for re-evaluation. Results: The median follow-up time was 25 months (range: 3� months). Of the 71 patients who underwent NAT, 57 patients underwent surgery. Downstaging was recorded in 48 (84.2%) of 57 patients who underwent surgery. There was no statistically significant difference between both MRI and PET-CT with pathology results in terms of response evaluation. As a result of the comparison of MRI and PET-CT with pathological results; sensitivity and specificity were 91.6% (44/48) and 22.2% (2/9) for MRI, and 100% (47/47) and 12.5% (1/8) for PET-CT, respectively. Conclusion: PET-CT and MRI are effective in predicting response to NAT and predictive for the pathological response. A more accurate response can be judged when both PET-CT and MRI are executed together in restaging after NAT

AN EVALUATION OF CLINICAL OUTCOMES AFTER ABDOMINAL MESH RECTOPEXY & DELORME'S PROCEDURE FOR RECTAL PROLAPSE AT TERTIARY HEALTH CARE CENTER.

Background: Rectal prolapse is protrusion of rectum through anal canal, and proccidentia ~ complete prolapse is the term used when full thickness rectal wall prolapse . 30 patients presenting with Materials and methods: mass per rectum were evaluated & diagnosed clinically as having rectal prolapse were included in the study. The recurrence rate for the abdominal mesh Results: rectopexy is considered to be lower than Perineal Delorme's procedure. There was no recurrence in the rectopexy group. There was 1 recurrence (10%) in Delorme's group. .Better outcomes achieved when treatment individualized to Conclusion: each patient. Abdominal rectopexy for patients who can tolerate laparotomy & significant constipation. .Delorme's considered in young patients with short prolapse but with acceptable recurrence rate.

Uso de stent en estenosis colorrectal benigna / Stent utilization in benign colorectal stenosis

Introducción. La estenosis colorrectal benigna hace referencia a una condición anatómica caracterizada por una disminución del diámetro de la luz intestinal distal a la válvula ileocecal, ocasionando una serie de signos y síntomas de tipo obstructivo. Es una entidad poco frecuente, secundaria en la gran mayoría de veces a la realización de anastomosis intestinales al nivel descrito. El objetivo de esta investigación fue determinar la utilidad del stentcolónico en estenosis secundaria a patología colorrectal no neoplásica. Métodos. Estudio descriptivo de una cohorte de pacientes que desarrolló estenosis colorrectal de origen benigna confirmada por colonoscopía, en 3 hospitales de alta complejidad de la ciudad de Medellín, Colombia, entre los años 2007 y 2021. Resultados. Se incluyeron 34 pacientes con diagnóstico de estenosis colorrectal de origen benigno, manejados con stents metálicos autoexpandibles. La mediana de seguimiento fue de 19 meses y se obtuvo éxito clínico en el 73,5 % de los casos. La tasa de complicación fue del 41,2 %, dada principalmente por reobstrucción y migración del stent, y en menor medida por perforación secundaria a la colocación del dispositivo. Conclusión. Los stents metálicos autoexpandibles representan una opción terapéutica en pacientes con obstrucción colorrectal, con altas tasas de mejoría clínica en pacientes con patología estenosante no maligna. Cuando la derivación por medio de estoma no es una opción, este tipo de dispositivos están asociados a altas tasas de éxito clínico y mejoría de la calidad de vida de los pacientes

Introduction. Benign colorectal stenosis refers to an anatomical condition characterized by a decrease in the diameter of the intestinal lumen distal to the ileocecal valve, which might cause a series of obstructive signs and symptoms. It is a rare entity, caused in the vast majority of cases due to intestinal anastomosis at the described level. The purpose of this study is to determine the performance of colonic stents in the management of non-malignant colorectal strictures. Methods. Descriptive study of a cohort of patients who developed a benign colorectal stenosis confirmed by colonoscopy in three high-complexity hospitals in the city of Medellín, Colombia, between 2007 and 2021. Results. Thirty-four patients diagnosed with benign colorectal stenosis managed with self-expanding metal stents were included in the study. Median follow-up was 19 months, obtaining clinical success in 73.5% of cases, with a complication rate of 41.2%, mainly due to reobstruction and migration of the stent, and to a lesser extent due to perforation secondary to device placement.Conclusion. Self-expanding metallic stents represent a therapeutic option in patients with colorectal obstruction caused by non-malignant stenosing pathology. When diversion through a stoma is not an option, this type of device is associated with high rates of clinical success and improvement in the patients' quality of life

Hoof beats could mean zebras: A rare late metastasis of breast carcinoma in the rectum

Breast cancer metastasis is most commonly observed in bone, lung, liver, and brain and is rarely observed in the gastrointestinal tract (GI). In rarer cases, GI metastasis reaches the rectum and generally presents as late metastasis. The type of breast cancer usually associated with GI metastasis is invasive lobular carcinoma; however, few case reports also show their association with invasive ductal carcinoma (IDC). Here, we report a case that unfortunately is a coalescence of all these atypical events, with metastatic rectal linitis plastica (RLP) of the breast, 15 years after the treatment of the primary tumor, originating from IDC. This is the first case report from India, reporting the late metastatic presentation of breast cancer as RLP. The report emphasizes the need to correlate persistent GI symptoms to breast cancer history; however, late the presentation may be.

Clinical Efficacy of Concept of Membrane Anatomy with Complete Mesangectomy in Radical Resection of Rectal Cancer / 肿瘤防治研究

Objective To compare the clinical efficacy between traditional laparoscopic surgery and laparoscopic surgery under the guidance of membrane anatomy with complete mesangectomy in the treatment of rectal cancer. Methods A retrospective cohort study was conducted on 60 patients with rectal cancer who were randomly divided into control group (n=30) and observation group (n=30) in accordance with the principle of randomization.The control group received traditional laparoscopic radical resection of rectal cancer, and the observation group received laparoscopic radical resection of rectal cancer under the guidance of membrane anatomy with complete mesangectomy.The different clinical application effects of the two groups were analyzed by comparing the general data, operation time, intraoperative blood loss, and postoperative rehabilitation. Results All the 60 patients underwent the laparoscopic radical resection of rectal cancer.No operation-related complications, conversion to laparotomy, or perioperative death cases were reported.No statistically significant differences in age, gender, operation time, postoperative exhaust time, drainage tube removal time, or postoperative complications were found between the two groups (all P > 0.05).Compared with the control group, the observation group had significantly less intraoperative blood loss and more lymph node dissected (P < 0.05). Conclusion Laparoscopic radical resection of rectal cancer guided by the membrane anatomy with complete mesangectomy can completely remove the mesorectum, enlarge and clear the surgical field, reduce intraoperative bleeding, thoroughly remove lymph nodes, and improve the quality of surgery.

Immunotherapy in the neoadjuvant chemoradiotherapy for locally advanced rectal cancer / 中华放射肿瘤学杂志

Long-course concurrent chemoradiotherapy (CCRT) or short-course radiotherapy (SCRT) prior to surgery and postoperative chemotherapy is one of the main standard therapies for patients with locally advanced rectal cancer (LARC). On this basis, total neoadjuvant therapy (TNT) has been shown to improve disease-free survival, distant metastasis-free survival and complete response rates, whereas the 3-year distant recurrence rate is still above 20% and pathological complete response (pCR) is less than 30%. Long-term survival and adverse reactions remain to be improved. Currently, significant achivement has been obtained in immunotherapy. Application of immunotherapy in the treatment of rectal cancer remains to be urgently validated. In recent years, immunotherapy combined with preoperative chemoradiotherapy has been adopted for LARC in clinical trials. Besides, immunotherapy alone, especially programmed death-1 (PD-1) / programmed death ligand-1 (PD-L1) inhibitor, has also been utilized to treat colon rectal cancer. Relevant research progress was reviewed in this article.

The role of radiomics and artificial intelligence in predicting and evaluating the efficacy of neoadjuvant chemoradiotherapy for rectal cancer / 中华放射肿瘤学杂志

Predicting and evaluating the efficacy of neoadjuvant therapy for rectal cancer are of clinical significance and health economic value. At present, exploring the methods of predicting and evaluating the efficacy of neoadjuvant therapy have become research hotspot, focus and difficulty at home and abroad. Radiomics and artificial intelligence (AI) are two rapidly developing technologies. It is worthy of integrating radiomics with AI to build a model for predicting and evaluating the efficacy of neoadjuvant therapy and support individualized clinical decision-making and treatment options. In this article, literature review related to neoadjuvant chemoradiotherapy for rectal cancer based on radiomics and AI was conducted, aiming to explore the prospect and advantages of radiomics and AI in the prediction and evaluation of neoadjuvant therapy.