Informe de un caso de liposarcoma paratesticular

Los liposarcomas son neoplasias que se originan de las células mesenquimales, y su localización paratesticular es infrecuente. Se dividen en cuatro subtipos histológicos, siendo el mixoide el más raro. Se muestra el informe de un caso de liposarcoma paratesticular mixoide y una revisión de la literatura, con el objetivo de brindar información sobre esta rara enfermedad. El caso es un paciente masculino de 70 años de edad, que acude a consulta por tumefacción escrotal derecha e indolora de 13 meses de evolución, diagnosticado inicialmente como una hernia inguinal unilateral. Se realizó orquiectomía inguinal radical derecha y ligadura de cordón alto. En anatomía patológica se recibe la pieza quirúrgica de 2500 g. Al estudio histológico se evidencia liposarcoma mixoide. La tomografía computarizada de tórax, abdomen y pelvis no mostró metástasis. La presencia de un liposarcoma debe tenerse en cuenta durante el estudio diagnóstico de masas escrotales, para minimizar la tasa de diagnóstico erróneo y manejo inadecuado.

Liposarcoma are neoplasms that originate from mesenchymal cells, and their paratesticular location is infrequent. They are divided into four histological subtypes, the myxoid being the rarest. The report of a case of myxoid paratesticular liposarcoma and a review of the literature are shown, with the aim of providing information on this rare disease. The case is a 70-years-old male patient who assists the clinic due to painless right scrotal swelling of 13 months evolution, who was initially diagnosed with a unilateral inguinal hernia. Right radical inguinal orchiectomy and high cord ligation were performed. The pathological piece of 2500g is received in pathological anatomy. Myxoid liposarcoma is evidenced at histological study. Chest, abdomen and pelvis computed tomography showed no metastasis. The presence of liposarcoma should be taken into account during the diagnostic study of scrotal masses to minimize the rate of misdiagnosis and inadequate management.

A rare case of primary giant myxoid liposarcoma of the pericardium

Primary pericardial neoplasms account for 6.7–12.8% of all primary tumors arising in the cardiac region. Pericardial tumors are most likely to be metastatic and are an extension of the primary tumors from the surrounding structures. Sarcomas of the pericardium are rare. Myxoid liposarcoma (ML) represents about 5% of all the soft-tissue sarcomas in adults. They are usually located in the deep soft tissues of the extremities. There have been less than 20 cases of pericardial liposarcomas reported on PubMed since 1973. Here, we present a rare case of primary giant pericardial myxoid liposarcoma (ML) in a 46-year-old female diagnosed on frozen section and later was confirmed histopathologically.

Liposarcoma retroperitoneal gigante bien diferenciado, un reporte de caso

Los liposarcomas son neoplasias malignas raras que se originan en el tejido adiposo, con mayor frecuencia en el retroperitoneo. De todas las variantes histológicas, el diferenciado es el más común y el de mejor pronóstico. El diagnóstico se establece con pruebas imagenológicas con o sin ayuda de biopsia. El tratamiento consiste en la resección completa del tumor, que puede o no acompañarse de terapia adyuvante. Se presenta el caso de un paciente de 41 años con distensión abdominal y pérdida de peso, en el que se confirma un liposarcoma retroperitoneal mediante una TC abdominal, por lo que fue sometido a una resección quirúrgica completa que resultó exitosa. El paciente se recuperó satisfactoriamente y se mantuvo sin recidivas durante el seguimiento. Se concluye que el diagnóstico y terapéutico varían de acuerdo con las características del tumor y su riesgo de recidiva; por lo que hasta la actualidad continúa siendo un desafío multidisciplinario.

SUMMARY Liposarcomas are rare malignant neoplasms that originate in adipose tissue, most frequently in the retroperitoneum. Of all histological variants, differentiated liposarcoma is the most common and has the best prognosis. Diagnosis is established by imaging tests with or without the aid of biopsy. Treatment consists of complete resection of the tumour, which may or may not be accompanied by adjuvant therapy. We present the case of a 41-year-old patient with abdominal distension and weight loss, who was confirmed to have retroperitoneal liposarcoma by abdominal CT scan and underwent successful complete surgical resection. The patient recovered satisfactorily and remained free of recurrence during follow-up. It is concluded that diagnosis and therapy vary according to the characteristics of the tumour and its risk of recurrence, which is why it remains a multidisciplinary challenge to this day.

Clinical value of fluorescence in situ hybridization with MDM2 and DDIT3 probe in diagnosis of liposarcoma / 北京大学学报(医学版)

OBJECTIVE@#To investigate the value of using MDM2 amplification probe and DDIT3 dual-color, break-apart rearrangement probe fluorescence in situ hybridization (FISH) technique in the diagnosis of liposarcoma.@*METHODS@#In the study, 62 cases of liposarcoma diagnosed in Peking University First Hospital from January 2015 to December 2019 were analysed for clinicopathological information. Of these 62 cases of liposarcoma, all were analysed for MDM2 amplification and 48 cases were analysed for DDIT3 rearrangement using a FISH technique. Our study aimed to evaluate the status of MDM2 and DDIT3 by FISH in liposarcoma and correlate it with diagnosis of different subtypes of liposarcoma. The subtypes of liposarcoma were classified according to the FISH results, combined with the relevant clinicopathological features.@*RESULTS@#The patients aged 31-89 years (mean: 59 years) with a 1.75:1 male to female ratio. Histologically, there were 20 cases of atypical lipomatous tumour/well-differentiated liposarcoma (ALT/WDLPS), 26 cases of dedifferentiated liposarcoma (DDLPS), 13 myxoid liposarcoma (MLPS) and 3 pleomorphic liposarcoma (PLPS). Tumors with DDLPS (23/26) and WDLPS (8/20) were localized retroperitoneally, while both tumours of MLPS and PLPS were localized extra-retroperitoneally, and the difference of sites among the four subtypes of liposarcoma was statistically significant (P < 0.05). Histologically, varied mucoid matrix could be observed in the four subtypes of liposarcoma, and the difference was statistically significant (P < 0.05). MDM2 gene amplification was demonstrated in all cases of ALT/WDLPS and DDLPS (100%, 20/20 and 26/26 respectively); DDIT3 gene rearrangement was noted only in MLPS (100%, 13/13); most cases of DDLPS (96.2%, 25/26) and ALT/WDLPS (83.3%, 5/6, 6 cases selected for detection) demonstrated the picture of amplification of the DDIT3 telomeric tag. According to the instructions of DDIT3 break-apart rearrangement probe, the 5' telomere probe and 3' centromere probe spanned but did not cover the DDIT3 gene itself, on the contrary, the 5' telomere probe covered the CDK4 gene, while the DDIT3 and CDK4 gene were located adjacent to each other on chromosome, therefore, when the amplification signal appeared on the telomeric tag of the DDIT3 rearrangement probe, it indeed indicated the CDK4 gene amplification rather than the DDIT3 gene rearrangement. Then the 10 cases with DDIT3 telomeric tag amplification were selected for CDK4 and DDIT3 gene amplification probe FISH tests, and all the cases showed CDK4 gene amplification (100%, 10/10) and two of the 10 cases demonstrated co-amplification of CDK4 and DDIT3 (20%, 2/10); DDIT3 polysomy detected by DDIT3 gene rearrangement probe was found in 1 case of DDLPS and 2 cases of PLPS (66.7%, 2/3) with morphology of high-grade malignant tumour and poor prognosis.@*CONCLUSION@#Our results indicate that a diagnosis of different subtype liposarcoma could be confirmed based on the application of MDM2 and DDIT3 FISH, combined with clinicopathological findings. It is also noteworthy that atypical signals should be correctly interpreted to guide correct treatment of liposarcomas.

Intraoral lipoma with degenerative changes mimicking atypical lipomatous tumor: an immunohistochemical study

ABSTRACT Lipomas are mesenchymal neoplasms relatively uncommon in the oral cavity. Lipomas can exhibit histopathological features mimicking atypical lipomatous tumors (ALT) or dysplastic lipoma (DL) in the presence of degenerative changes. Relevantly, immunohistochemistry assists in the correct diagnosis. Herein, we present the case of a 54-year-old male with a sessile nodule located on the dorsum of the tongue. The histopathological analysis showed a diffuse, non-circumscribed adipocytic proliferation constituted by cells of variable size containing cytoplasmic vacuoles and displaced nuclei, some resembling lipoblasts supported by fibrous connective tissue stroma. By immunohistochemistry, tumor cells were positive for vimentin, S100, FASN, CD10, and p16. Rb expression was intact. Moreover, CD34, p53, MDM2, and CDK4 were negative. After 2-year of follow-up, no alteration or recurrence was observed. In conclusion, MDM2, CDK4, p53, and Rb immunomarkers can be used reliably to differentiate benign lipoma with degenerative changes from ALT and DL.

Histopathological Spectrum of Myxoid Soft‑Tissue Neoplasms in a Tertiary Care Center with a Special Focus on Vascular Patterns: A 13‑Year Compilation

Introduction: Myxoid soft‑tissue tumors are a diverse group of tumors which have similar histomorphology but have varied geneticsequence and clinical outcome, hence differentiating and diagnosing them is a challenge for any pathologist. This study describes the varioushistomorphological spectrum and vascular pattern of various myxoid soft‑tissue tumors. Materials and Methods: This was a retrospective and prospective observational study of myxoid soft‑tissue tumors over a period of 13 years. A total of 224 cases with myxoid morphology were included and were examined morphologically with a special focus on the vascular pattern. SPSS v 24 was used for statistical analysis. Results: The predominant lesions were benign in 164 (73.21%) cases, followed by malignant lesions in 43 (19.19%) cases and intermediate lesions 17 (7.58%) cases. Both benign and malignant lesions showed a male preponderance and were seen to arise predominantly from the extremities. The most common benign myxoid lesions in this study were of neural origin with myxoid neurofibroma constituting 65 (29. 01%) cases, followed by schwannoma 38 (16.9%) cases. Myxoid dermatofibrosarcoma protuberans was the most common intermediatelesion. Tumors with adipocytic differentiation were the predominant lesions among the malignant group, i.e myxoid liposarcoma seen in 17 (7.5%) cases. Conclusions: Vascular pattern in the myxoid lesions are subtle yet crucial in arriving at a histo‑morphological diagnosis. Further studies correlating the vascular pattern with the genetic profile of these tumours can help arriving at a histo‑morphological diagnosisof myxoid lesions.

Intraperitoneal dissemination of primary dedifferentiated liposarcoma of omentum simulating an ovarian cancer – A case report

Dedifferentiated Liposarcoma (DDLPS) is a rare subtype of liposarcoma with a high preponderance of local recurrence and distant metastasis. The frequent site of DDLPS is the retroperitoneum, followed by the limbs and trunk. The primary omental DDLPS is very rare and only a few cases have been reported in the literature. Here we report a rare case of primary giant DDLPS of omentum with intraperitoneal metastasis in a 61year old woman. The present case report adds to our knowledge, that a case of intraperitoneal DDLPS can mimic ovarian cancer clinically and should be considered in the differential diagnosis of a pelvic mass in postmenopausal women.

Lipossarcoma Pleomórfico de Mama em Paciente Jovem ­ Relato de Caso / Pleomorphic Breast Liposarcoma in a Young Patient ­ Case Report

O Sarcoma de partes moles é um tumor maligno raro, correspondendo a aproximadamente 1% dos tumores malignos em adultos. Objetivamos descrever um raro caso de Lipossarcoma pleomórfico em paciente jovem, sem história familiar, que representa 0,3% dos sarcomas da mama. Relatamos o caso de uma paciente do sexo feminino, 39 anos, com nodulação em prolongamento axilar de mama esquerda, cujas mamografia e ecografia caracterizaram nodulação regular, de limites definidos, sem fluxo central ou periférico e ecotextura heterogênea. A Core-Biopsy diagnosticou neoplasia maligna fusocelular. Realizada ressecção segmentar, cujos laudos histopatológico e de imuno-histoquímica concluíram como sendo Lipossarcoma pleomórfico de alto grau. O sarcoma pleomórfico é um subtipo raro e agressivo entre os lipossarcomas. O seu tratamento, assim como dos sarcomas de mama, é a ressecção cirúrgica com margens de segurança; a terapia adjuvante com radioterapia é indicada devido à taxa de recorrência deste tumor. A quimioterapia ainda tem papel indefinido nesses tipos de tumores. Concluímos que, por ser o Lipossarcoma pleomórfico uma neoplasia maligna rara, o diagnóstico e a conduta adequados se fazem necessários para prover terapêutica precisa e conter metastatização e recidiva local.

Soft tissue sarcoma is a rare malignant tumor, accounting for approximately 1% of malignant tumors in adults. We aim to describe a rare case of pleomorphic liposarcoma in a young patient with no family history, representing 0.3% of breast of breast sarcomas. We report the case of a 39-year-old female patient with nodulation in the axillary extension of the left breast, whose mammogram and ultrasonography characterized a regular nodulation, with defined limits, without central or peripheral flow, and heterogeneous echotexture. The Core-Biopsy diagnosed malignant fusocellular neoplasm. Segmental resection was performed. The histopathological and immunohistochemistry reports concluded that it was a high grade pleomorphic liposarcoma. Pleomorphic sarcoma is a rare and aggressive subtype among the liposarcomas. Its treatment, as with breast sarcomas, is surgical resection with safety margins; adjuvant therapy with radiotherapy is indicated due to the recurrence rate of this tumor. Chemotherapy still has an undefined role in these types of tumors. We conclude that, because pleomorphic liposarcoma is a rare malignant neoplasm, the diagnosis and management are necessary to provide an accurate therapy and contain metastasis and local recurrence.

A giant retroperitoneal liposarcoma with hemoperitoneum: A rare tumor with unusual presentation

Retroperitoneal liposarcoma (RPLS) is a rare mesenchymal tumor which accounts for 0.02–0.7% of all malignancy. The presentations of these tumors are non-specific and early diagnosis is often missed. We are reporting a rare case of 17-year-old girl who came to us with complaints of abdominal distension and other non-specific symptoms but after few hours of admission, she had acute abdomen with hemodynamic instability. She underwent emergency laparotomy and found to have a giant 25 × 20 × 10 cm ruptured retroperitoneum tumor causing hemoperitoneum. The tumor involved left ovary and fallopian tube as well. Complete resection of tumor with left salpingooophorectomy was done. The patient was kept in intensive care unit and discharged in good health after 15 days. This presentation of RPLS has not been reported yet and may demand early diagnosis and management of these tumors. The histopathology revealed dedifferentiated liposarcoma with rhabdomyosarcomatous differentiation. The patient is completely fine at 16 months of follow-up while writing this report. Again, heterologous dedifferentiation of liposarcoma with spindle cell component is a rare morphologic spectrum. Liposarcomas can have various histologic types. In dedifferentiated types, the line of differentiation needs to be identified to decide further line of treatment. Therefore, thorough histopathological analysis and immunostaining is needed. Treatment includes complete surgical resection. Role of radiotherapy and chemotherapy is debatable and is still under trial. Dedifferentiated RPLS with rhabdomyosarcomatous differentiation is a rare tumor and its presentation as acute abdomen and hemoperitoneum has never been reported previously

Detection of MDM2 gene amplification on tissue microarray-based Fluorescence In-Situ Hybridization (FISH) in well-differentiated and dedifferentiated liposarcomas, displaying a wide morphological spectrum: A validation study at a tertiary cancer referral centre

Background: Liposarcomas including atypical lipomatous tumors (ALT)/well-differentiated liposarcomas (WDLPS) and dedifferentiated liposarcomas (DDLPSs) display a histomorphological spectrum with their several diagnostic mimics. Murine double minute 2(MDM2) gene amplification characterizes ALT/WDLPS and DDLPS. Presently, there is no documented study from our subcontinent on the validation of MDM2 gene testing in these tumors. Material and Methods: Twenty-eight cases, diagnosed as ALT/WDLPS (n = 5) and DDLPSs (n = 23), along with 10 other tumors were tested for MDM2 gene amplification, using fluorescence in situ hybridization (FISH) on tissue microarrays (TMAs). Fourteen cases, diagnosed as ALT/WDLPS and DDLPS, along with 49 other tumors were tested for MDM2 immunostaining. Twenty tumors were tested for p16INK4a immunostaining. Results: FISH was interpretable in 25 (89.2%) cases. Among the 20 cases diagnosed as DDLPSs, 19 displayed MDM2 gene amplification. Among the 5 cases diagnosed as ALT/WDLPS, four showed MDM2 gene amplification. Finally, 19 cases were confirmed as DDLPS and 4 as ALT/WDLPS. Furthermore, 7/19 cases confirmed as DDLPS and all 4 cases as ALT/WDLPS tested for MDM2 immunostaining, displayed its diffuse immunoexpression, while a single case of DDLPS showed its focal immunostaining. None of the 49 control cases displayed diffuse MDM2 immunoexpression. ALL 16 DDLPSs and 4 cases of ALT/WDLPS displayed p16INK4a immunostaining. The sensitivity for diffuse MDM2 immunostaining was 87.5% in cases of DDLPS, 100% in ALT/WDLPS, and specificity was 100%. The sensitivity for MDM2 gene amplification was 94.7% in cases of DDLPS and 100% in cases of ALT/WDLPS. The sensitivity for p16INK4a was 100%. Conclusion: This constitutes the first sizable study on MDM2 testing in ALT/WDLPS and DDLPS from our subcontinent using TMAs. MDM2 gene amplification testing continues as the diagnostic gold standard for ALTs/WDLPSs and DDLPSs and is useful in cases of diagnostic dilemmas. Diffuse MDM2 (IF2 clone) and p16INK4a immunostaining, together seem useful for triaging cases for FISH.

Liposarcoma vulvar desdiferenciado con diferenciación homóloga a liposarcoma pleomórfico: reporte de caso / Dedifferentiated vulvar liposarcoma with homologous differentiation to pleomorphic liposarcoma: case report

Resumen ANTECEDENTES: Los liposarcomas son un tipo de tumor de partes blandas. El subtipo desdiferenciado es una de las variantes más comunes junto con el liposarcoma bien diferenciado. CASO CLÍNICO: Paciente de 68 años que acudió a consulta por aparición de una masa en la zona vaginal que clínicamente se diagnosticó como hernia inguinal directa. Se procedió a la resección quirúrgica de la masa. El reporte histopatológico fue de miofibrolipoma, sin atipias y con bordes libres de neoplasia. Tres años después, la paciente retornó a la consulta por reaparición de la masa y se negó a una nueva biopsia. Posteriormente, en el 2020, la paciente aceptó la resección de la masa; el reporte histopatológico fue: liposarcoma desdiferenciado con diferenciación lipoblástica homóloga a liposarcoma pleomórfico. CONCLUSIÓN: Los estudios histopatológicos son necesarios para la confirmación del diagnóstico y la resección quirúrgica es el tratamiento de elección.

Abstract BACKGROUND: Liposarcomas are a type of soft tissue tumor. The dedifferentiated subtype is one of the most common variants along with well-differentiated liposarcoma. CLINICAL CASE: A 68-year-old female patient presented for consultation due to the appearance of a mass in the vaginal area which was clinically diagnosed as a direct inguinal hernia. Surgical resection of the mass was performed. The histopathological report was myofibrolipoma, without atypia and with borders free of neoplasia. Three years later, the patient returned to the office for recurrence of the mass and refused a new biopsy. Subsequently, in 2020, the patient accepted the resection of the mass; the histopathologic report was: dedifferentiated liposarcoma with lipoblastic differentiation homologous to pleomorphic liposarcoma. CONCLUSION: Histopathological studies are necessary for confirmation of the diagnosis and surgical resection is the treatment of choice.

Lipoma gigante na mão: um desafio cirúrgico / Giant hand lipoma: a surgical challenge

O lipoma é um tumor frequente dos tecidos moles e pode localizar-se em qualquer parte do corpo; no entanto, sua apresentação na mão é rara. São chamados gigantes quando excedem 5cm; nestes casos, o diagnóstico diferencial deve ser feito com lipossarcoma. Os lipomas devem ser caracterizados no pré-operatório com um exame de imagem, e seu tratamento é cirúrgico. Apresentamos o caso de uma paciente com um lipoma gigante da mão dominante, tratada com sucesso com uma abordagem cirúrgica modificada de Bruner

Lipomas are frequent soft tissue tumors and can be found anywhere in the body; however, their location in hand is rare. They are called giants when they exceed 5 cm. In these cases, the differential diagnosis must be made with liposarcoma. These benign tumors must be characterized preoperatively with an imaging study, and their treatment is surgical. We present the case of a patient with a giant hand lipoma successfully treated with a modified Bruner incision approach

Sclerosing variant of well-differentiated testicular liposarcoma: a case report / Lipossarcoma testicular bem diferenciado com variante esclerosante: um relato de caso

ABSTRACT Testicular cancers are classified in germ cell and non-germ cell tumors, as well as, liposarcomas. We report the case of a patient with a large testicular liposarcoma, submitted to surgical treatment with excision of scrotal pouch and segment of the spermatic cord, and the left testicle, showing a good evolution. This report presents one of the first cases of a sclerosing variant of well-differentiated testicular liposarcoma, large in size and with no association with another cancer. Due to their location, the diagnosis is difficult and unusual. Complete tumor resection and regular medical follow-up show a good prognosis, less recurrence, and little cellular differentiation.

RESUMEN Los cánceres de testículo se clasifican en tumores de células germinales y células no germinales, así como en liposarcomas. Presentamos el caso de un paciente con un gran liposarcoma testicular, sometido a tratamiento quirúrgico con exéresis de la bolsa escrotal y segmento de cordón espermático y testículo izquierdo, con buena evolución. Este informe presenta uno de los primeros casos de una variante esclerosante de liposarcoma testicular bien diferenciado, de gran tamaño y sin asociación con otro cáncer. Debido a su ubicación, el diagnóstico es difícil e inusual. La resección completa del tumor y el seguimiento médico regular muestran un buen pronóstico, menor recidiva, y poca diferenciación celular.

RESUMO Os tumores testiculares são classificados em células germinativas e não germinativas, assim como os lipossarcomas. Relatamos o caso de um paciente com lipossarcoma testicular de grande dimensão submetido a tratamentos cirúrgicos com ressecção de bolsa escrotal e segmento do cordão espermático e do testículo esquerdo, apresentando boa evolução do quadro. O relato traz um dos primeiros casos de lipossarcoma testicular bem diferenciado com variante esclerosante, de grande dimensão e sem associação a outra neoplasia. Devido à localização, apresenta diagnóstico difícil e pouco habitual. Com a ressecção total do tumor e o acompanhamento médico regular, o paciente apresenta bom prognóstico, menor recidiva e pouca diferenciação celular.

Clinicopathological risk factors of retroperitoneal liposarcoma recurrence-free survival after surgical resection / 中华普通外科杂志

Objective:To explore the clinicopathological risk factors of retroperitoneal liposarcoma recurrence-free survival after surgical resection, and establish a prediction model based on clinicopathological risk factors.Methods:We conducted a retrospective analysis for retroperitoneal liposarcoma patients undergoing surgical resection at Department of General Surgery, Shanghai Public Health Clinical Center, Zhongshan Hospital (South), Fudan University, during Jul 2014 and Jun 2020. The clinical and pathological data were collected. Univariate and multivariate analysis were used to select independent risk factors.Result:A total of 271 patients were included, and 127 (46.9%) were recurred. In the recurrence group, more patients were assessed as recurrent disease ( χ2=15.289, P<0.05), the proportion of tumors invading organs was higher ( χ2=10.123, P<0.05), and FNCLCC graded higher ( χ2=7.650, P<0.05). The median follow-up time for all patients was 25 months (1-58 months). The 1, 2, and 3-year recurrence-free survival rates were 61.4%, 40.3%, and 30.9%, respectively. Univariate analysis suggests that recurrent disease, organ invasion, poorly differentiated pathological types, and high FNCLCC grades are poor prognostic factors for postoperative recurrence (all P<0.05); Multivariate analysis showed that recurrent disease ( OR=3.135, 95% CI: 2.058-4.762, P<0.05), organ invasion ( OR=2.577, 95% CI: 1.214-5.464, P<0.05) and high FNCLCC grade ( P<0.05) is an independent prognostic factor for postoperative recurrence. Conclusion:Presentation status,FNCLCC grade and organ invasion were independent risk factors for retroperitoneal liposarcoma recurrence after surgery.

Lumbociatalgia como presentación de un liposarcoma del psoas iliaco: Reporte de caso / Lumbociatalgia as presentation of a liposarcoma from psoas iliaco muscle: Case report

Introducción. Los sarcomas retroperitoneales son tumores raros, con una presentación clínica dada por síntomas compresivos poco específicos. Reporte de Caso: Reportamos un caso de un varón de 69 años con historia de lumbociatalgia e incremento en el volumen del miembro inferior izquierdo hasta llegar a la incapacidad para deambular, se le realizó una Tomografía Abdominal Con Contraste donde se halló una gran tumoración dependiente del músculo psoas iliaco izquierdo que se extendía hasta la pelvis, la cual fue sometida a biopsia encontrándose un Liposarcoma de psoas de alta celularidad. Conclusiones: Los sarcomas son tumores raros originados del tejido mesequenquimal, la gran mayoría de estos tienen síntomas y signos inespecíficos siendo diagnosticados de forma tardía y a pesar del manejo quirúrgico el pronóstico es pobre.

Introduction. Retroperitoneal sarcomas are rare tumors, with a clinical presentation given by poorly specific compression symptoms. Case Report: We report a case of a 69-year-old man with a history of lumbociatalgia and an increase in the volume of the left lower limb until he was unable to wander, he underwent a Contrast Abdominal Tomography where a large tumor dependent on the left iliac psoas muscle was found, that extended to the pelvis, which was biopsied, finding a highly cellular psoas Liposarcoma. Conclusions: Sarcomas are rare tumors originating from the mesequenchymal tissue, the vast majority of them have nonspecific symptoms and signs, being diagnosed late and despite the surgical management of the prognosis is poor.

Liposarcoma mixoide de omento mayor. Presentación de un caso y revisión de la literatura / Myxoid Liposarcoma of the Greater Omentum. Case Report and Literature Review

RESUMEN El liposarcoma es un tumor maligno de origen mesodérmico derivado del tejido adiposo. Es el más frecuente de los sarcomas de partes blandas en el adulto. La localización más frecuente es en extremidades inferiores; la abdominal es rara. Llega a alcanzar enormes proporciones. El tratamiento es la cirugía con resección completa para el control local de la enfermedad. Se presenta el caso de una paciente que acudió por hallazgo ecográfico de tumor intrabdominal en hipogastrio de origen no precisado, con evolución asintomática. Al examen físico se constató proceso tumoral palpable hacia hipogastrio de aproximadamente 3cm, suave, móvil, no superficial, no doloroso a la palpación. Se realizó laparotomía exploradora electiva, con omentectomía total por tumor en borde libre del omento mayor. La biopsia informó la presencia de liposarcoma mixoide de omento mayor. Debido a la poca frecuencia de este tipo de lesión se decide presentar el caso de esta paciente.

ABSTRACT Liposarcoma is a malignant tumor of mesodermal origin derived from adiposetissue. It is the most frequent of the soft tissue sarcomas in adults. Themost frequent location is in the lower extremities, the abdominal is rare.It reaches enormous proportions. Treatment is surgery with completerresection for local control of the disease. The case of a patient whopresented due to ultrasound finding of an intra-abdominal tumor in thehypogastrium of unspecified origin, with asymptomatic evolution, ispresented. Physical examination revealed a palpable tumor process towardsthe hypogastrium of approximately 3cm, smooth, mobile, non-superficial, notpainful on palpation. Elective exploratory laparotomy was performed, withtotal omentectomy for tumor on the free edge of the greater omentum. Biopsyreported the presence of myxoidliposarcoma of the greater omentum. Due tothe infrequency of this type of injury, it was decided to present the caseof this patient.

Abdominal Actinomycosis misdiagnosed as liposarcoma

Actinomycosis is an uncommon, endogenous, and chronic infection with varied and nonspecific clinical features such as abdominal, pelvic or cervical masses, ulcerative lesions, abscesses, draining fistula, fibrosis, and constitutional symptoms. The disease ensues when the bacteria disrupt the mucosal barrier, invade, and spread throughout interfascial planes. Currently, the diagnosis of actinomycosis is challenging because of its very low frequency and depending on the clinical presentation it may masquerade malignancies. Therapy consists initially in intravenous penicillin, followed by an oral regimen that may be extended until a year of treatment. A timely diagnosis is crucial to avoid extensive therapeutic attempt as surgery. However, a biopsy or drainage of abscesses and fistula's tract may be required not only as a diagnostic procedure as part of the therapy. We report the case of a 72-year-old woman with an abdominal mass initially misdiagnosed as a liposarcoma. A second biopsy of a skin lesion of the abdominal wall made the diagnosis of actinomycosis, avoiding a major surgical procedure. The patient was treated with a long-term course of antibiotics with favorable outcome. Liposarcoma was ruled out after the patient's full recovery with antibiotics and the misdiagnosis was credit to the overconfidence on the immunohistochemical positivity to MDM2.

Paratesticular well-differentiated liposarcoma initially diagnosed as fibrous pseudotumour

Paratesticular tumours are relatively rare and mostly of the mesenchymal origin. Due to its rarity, general surgical pathologists might have limited experience on the diagnostic entities and relevant differential diagnoses related to mesenchymal paratesticular tumours. This may likely cause diagnostic difficulties in a daily pathology practice. Paratesticular liposarcoma is a highly heterogeneous tumour and may be misdiagnosed as a benign fibromatous lesion. Herein we present a case of well-differentiated paratesticular liposarcoma of the sclerosing type initially diagnosed as a fibrous pseudotumour. Main differential diagnostic considerations are highlighted.

Leg myxoid liposarcoma: correlation between image and anatomopathological tests / Lipossarcoma mixoide da perna: correlação entre os exames de imagem e anatomopatológico

ABSTRACT A 41-year-old male patient refers to a painful tumor on the lateral side of the right leg. Ultrasonography visualized a predominantly hypoechoic well-delineated large heterogeneous mass in the subcutaneous tissue, showing an internal hyperechoic area. Magnetic resonance imaging (MRI) demonstrated an oval and lobulated tumor with well-defined margins at the anterolateral part of the leg, with contrast enhancement. The anatomopathological evaluation revealed a neoplasm with an extensive chondromyxoid matrix. The immunohistochemical study demonstrated positive vimentin (V9 clone), positive S-100 protein and negative desmin (D33 clone), smooth muscle actin (1A4), CD68 (KP1 clone) and caldesmon. The set of findings is compatible with myxoid liposarcoma.

RESUMEN Paciente masculino de 41 años de edad, reporta tumor doloroso en la parte lateral de la pierna derecha. La ultrasonografía demostró una masa voluminosa, hipoecogénica, heterogénea y bien delimitada en el tejido subcutáneo, con área hiperecogénica en su interior. La resonancia magnética (RM) reveló un tumor ovalado y lobulado, con márgenes bien definidas en la parte anterolateral de la pierna, presentando realce de contraste. El estudio anatomopatológico constató neoplasia con abundante matriz condromixoide. La inmunohistoquímica presentó vimentina (clon V9) y proteína S-100 positivas, y desmina (clon D33), actina de músculo liso (1A4), CD68 (clon KP1) y caldesmón negativos. El conjunto de hallazgos es compatible con liposarcoma mixoide.

RESUMO Paciente do sexo masculino, 41 anos de idade, relata tumor doloroso na face lateral da perna direita. A ultrassonografia demonstrou massa volumosa, hipoecogênica, heterogênea e bem delineada no tecido subcutâneo, com área hiperecogênica em seu interior. A ressonância magnética (RM) revelou um tumor ovalado e lobulado, com margens bem definidas na parte anterolateral da perna, apresentando realce pelo contraste. O estudo anatomopatológico constatou neoplasia com extensa matriz condromixoide. O estudo imuno-histoquímico apresentou vimentina (clone V9) e proteína S-100 positivas e desmina (clone D33), actina de músculo liso (1A4), CD68 (clone KP1) e caldesmon negativos. O conjunto de achados é compatível com lipossarcoma mixoide.

A case of laparoscopic resection of myxoid liposarcoma of the greater omentum

@#Primary omental liposarcoma is a rare clinical entity with less than 20 cases being reported in the literature. Laparotomy has been the traditional approach for resection, with no reports of laparoscopic resection. A 39-year-old lady presented at the Sarawak General Hospital, Kuching, Malaysia with a history of a progressive, painless left upper quadrant abdominal swelling for a year. CT scan showed a well-defined heterogeneously enhancing cystic mass measuring 7.5x7.5x8.1cm with a poor plane with the adjacent greater curvature of stomach and transverse colon. Upper and lower endoscopy was normal. The tumour was completely dissected from the adjacent transverse colon and removed laparoscopically. Histopathological examination of the resected specimen revealed a myxoid liposarcoma. She had an uneventful recovery and was discharged well on the third postoperative day. She subsequently underwent adjuvant chemotherapy and was well at 1-year follow-up with PET CT showing no evidence of recurrence or metastases.