GCDN-Net: Garbage classifier deep neural network for recyclable urban waste management.

The escalating waste volume due to urbanization and population growth has underscored the need for advanced waste sorting and recycling methods to ensure sustainable waste management. Deep learning models, adept at image recognition tasks, offer potential solutions for waste sorting applications. These models, trained on extensive waste image datasets, possess the ability to discern unique features of diverse waste types. Automating waste sorting hinges on robust deep learning models capable of accurately categorizing a wide range of waste types. In this study, a multi-stage machine learning approach is proposed to classify different waste categories using the "Garbage In, Garbage Out" (GIGO) dataset of 25,000 images. The novel Garbage Classifier Deep Neural Network (GCDN-Net) is introduced as a comprehensive solution, adept in both single-label and multi-label classification tasks. Single-label classification distinguishes between garbage and non-garbage images, while multi-label classification identifies distinct garbage categories within single or multiple images. The performance of GCDN-Net is rigorously evaluated and compared against state-of-the-art waste classification methods. Results demonstrate GCDN-Net's excellence, achieving 95.77% accuracy, 95.78% precision, 95.77% recall, 95.77% F1-score, and 95.54% specificity when classifying waste images, outperforming existing models in single-label classification. In multi-label classification, GCDN-Net attains an overall Mean Average Precision (mAP) of 0.69 and an F1-score of 75.01%. The reliability of network performance is affirmed through saliency map-based visualization generated by Score-CAM (class activation mapping). In conclusion, deep learning-based models exhibit efficacy in categorizing diverse waste types, paving the way for automated waste sorting and recycling systems that can mitigate costs and processing times.

[Two decades of experience in endovascular treatment of varicocele in pediatric age]. / Dos décadas de experiencia en el tratamiento endovascular del varicocele en la edad pediátrica.

OBJECTIVES: To present our experience of 23 years in the treatment of varicocele by embolization in pediatric age. MATERIAL AND METHODS: Observational descriptive study of all patients with varicocele treated by embolization after phlebography, by indication of the pediatric surgery service between 1995 and 2017. We performed descriptive statistical analysis and comparison between pain and testicular asymmetry before and after treatment (SPSSv22). RESULTS: Embolization was performed in 113 patients with left varicocele. The mean age of diagnosis was 12.4 years (5.2-15.5). The main clinical manifestations were: incidental finding (46.7%), increase in scrotal volume (28%) and testicular pain (15.9%). 61.5% were grade 3 and 38.5% grade 2. The selective embolization procedure was performed at an average age of 13.6 years (8-18). There were no serious complications of the procedure or reactive hydrocele. The overall success rate of endovascular treatment was 93.8%. In 85 patients (75.2%) a single procedure was performed and in 21, two procedures (18.6%). Only 4 patients required surgical intervention. The pain disappeared in all cases in which it presented and the testicular asymmetry decreased from 44.7% pre-treatment to 21.2% post-treatment (p<0.05). CONCLUSIONS: Endovascular treatment through embolization allows a selective varicocele management, after venous mapping, with an adequate effectiveness, without altering the arterial flow of the testicle or producing hydrocele. It is a minimally invasive treatment that could be considered the first choice in varicoceles of children and adolescents.

OBJETIVOS: Presentar nuestra experiencia de 23 años en el tratamiento del varicocele mediante embolización en la edad pediátrica. MATERIAL Y METODOS: Estudio descriptivo observacional de todos los pacientes con varicocele tratados mediante embolización previa flebografía, por indicación del servicio de cirugía pediátrica entre los años 1995 a 2017. Realizamos análisis estadístico descriptivo y comparación entre dolor y asimetría testicular previa y posterior al tratamiento (SPSSv22). RESULTADOS: Se realizó embolización en 113 pacientes con varicocele izquierdo. La edad media de diagnóstico fue de 12,4 años (5,2-15,5). Las manifestaciones clínicas principales fueron: hallazgo incidental (46,7%), aumento de volumen escrotal (28%) y dolor testicular (15,9%). El 61,5% eran de grado 3 y el 38,5% de grado 2. El procedimiento de embolización selectiva se realizó a una edad media de 13,6 años (8-18). No se presentaron complicaciones graves del procedimiento ni hidrocele reactivo. En 85 pacientes (75,2%) se realizó un único procedimiento y en 21, dos procedimientos (18,6%). La tasa de éxito global del tratamiento endovascular fue de 93,8%. Solo 4 pacientes requirieron intervención quirúrgica. El dolor desapareció en todos los casos en que se presentaba y la asimetría testicular disminuyó del 44,7% pretratamiento al 21,2% postratamiento (p<0,05). CONCLUSIONES: El tratamiento endovascular mediante embolización permite un manejo selectivo del varicocele, previo mapeo venoso, con una adecuada efectividad, sin alterar el flujo arterial del testículo ni producir hidrocele. Es un tratamiento poco invasivo que se puede considerar de primera elección en varicoceles de niños y adolescentes.

Dos décadas de experiencia en el tratamiento endovascular del varicocele en la edad pediátrica / Two decades of experience in endovascular treatment of varicocele in pediatric age

Objetivos: Presentar nuestra experiencia de 23 años en el tratamiento del varicocele mediante embolización en la edad pediátrica. Material y método: Estudio descriptivo observacional de todos los pacientes con varicocele tratados mediante embolización previa flebografía, por indicación del servicio de cirugía pediátrica entre los años 1995 a 2017. Realizamos análisis estadístico descriptivo y comparación entre dolor y asimetría testicular previa y posterior al tratamiento (SPSSv22). Resultados: Se realizó embolización en 113 pacientes con varicocele izquierdo. La edad media de diagnóstico fue de 12,4 años (5,2-15,5). Las manifestaciones clínicas principales fueron: hallazgo incidental (46,7%), aumento de volumen escrotal (28%) y dolor testicular (15,9%). El 61,5% eran de grado 3 y el 38,5% de grado 2. El procedimiento de embolización selectiva se realizó a una edad media de 13,6 años (8-18). No se presentaron complicaciones graves del procedimiento ni hidrocele reactivo. En 85 pacientes (75,2%) se realizó un único procedimiento y en 21, dos procedimientos (18,6%). La tasa de éxito global del tratamiento endovascular fue de 93,8%. Solo 4 pacientes requirieron intervención quirúrgica. El dolor desapareció en todos los casos en que se presentaba y la asimetría testicular disminuyó del 44,7% pretratamiento al 21,2% postratamiento (p<0,05). Conclusiones: El tratamiento endovascular mediante embolización permite un manejo selectivo del varicocele, previo mapeo venoso, con una adecuada efectividad, sin alterar el flujo arterial del testículo ni producir hidrocele. Es un tratamiento poco invasivo que se puede considerar de primera elección en varicoceles de niños y adolescentes

Objectives: To present our experience of 23 years in the treatment of varicocele by embolization in pediatric age. Material and methods: Observational descriptive study of all patients with varicocele treated by embolization after phlebography, by indication of the pediatric surgery service between 1995 and 2017. We performed descriptive statistical analysis and comparison between pain and testicular asymmetry before and after treatment (SPSSv22). Results: Embolization was performed in 113 patients with left varicocele. The mean age of diagnosis was 12.4 years (5.2-15.5). The main clinical manifestations were: incidental finding (46.7%), increase in scrotal volume (28%) and testicular pain (15.9%). 61.5% were grade 3 and 38.5% grade 2. The selective embolization procedure was performed at an average age of 13.6 years (8-18). There were no serious complications of the procedure or reactive hydrocele. The overall success rate of endovascular treatment was 93.8%. In 85 patients (75.2%) a single procedure was performed and in 21, two procedures (18.6%). Only 4 patients required surgical intervention. The pain disappeared in all cases in which it presented and the testicular asymmetry decreased from 44.7% pre-treatment to 21.2% post-treatment (p<0.05). Conclusions: Endovascular treatment through embolization allows a selective varicocele management, after venous mapping, with an adequate effectiveness, without altering the arterial flow of the testicle or producing hydrocele. It is a minimally invasive treatment that could be considered the first choice in varicoceles of children and adolescents

Disección carotídea secundaria a herida cervical por arma de fuego / Carotid dissection secondary to cervical wound by a firearm

No disponible

Study of the inferior colliculus in patients with schizophrenia by magnetic resonance spectroscopy.

INTRODUCTION. Previous studies have suggested morphometric and functional abnormalities in the inferior colliculus in patients with schizophrenia. Auditory hallucinations are one of the central symptoms in schizophrenia. In this complex and multidimensional event both attention and emotion are thought to play a key role. AIM. To study metabolic changes in the inferior colliculus, a nucleus integrated in the auditory pathway, in patients with schizophrenia and the possible relationship with auditory hallucinations. SUBJECTS AND METHODS. Magnetic resonance spectroscopic imaging studies were performed in 30 right-handed patients with chronic schizophrenia (19 of them with auditory hallucinations) and 28 controls. A magnetic resonance spectroscopic imaging 2D slice was acquired and the voxels representative of both inferior colliculi were selected. N-acetylaspartate (NAA), creatine (Cr) and choline (Cho) peak areas were measured. RESULTS. The patients with schizophrenia showed a NAA/Cr significant reduction in the right inferior colliculus compared to the control subjects. The metabolic data in the right inferior colliculus were correlated with emotional auditory hallucinations items. CONCLUSIONS. The contribution of the inferior colliculus on neural underpinnings of auditory hallucinations is particularly relevant for the right inferior colliculus and is centered on attention-emotional component of this symptom.

TITLE: Estudio del coliculo inferior de pacientes con esquizofrenia mediante espectroscopia de resonancia magnetica.Introduccion. Algunos estudios anteriores en pacientes con esquizofrenia han sugerido alteraciones morfometricas y funcionales en el coliculo inferior. Las alucinaciones auditivas son uno de los sintomas centrales en la esquizofrenia. Se piensa que en este evento complejo y multidisciplinar, tanto la atencion como la emocion desempeñan un papel clave. Objetivo. Estudiar los cambios metabolicos en el coliculo inferior, un nucleo integrado en la via auditiva, en pacientes con esquizofrenia y su posible relacion con las alucinaciones auditivas. Sujetos y metodos. Se llevaron a cabo estudios de espectroscopia de resonancia magnetica en 30 pacientes diestros con esquizofrenia cronica (19 de ellos con alucinaciones auditivas) y 28 controles. Se adquirio una secuencia 2D de espectroscopia de resonancia magnetica y se seleccionaron los voxeles representativos de ambos coliculos inferiores. Se calculo el area de los picos de N-acetilaspartato (NAA), creatina (Cr) y colina (Co). Resultados. Los pacientes con esquizofrenia mostraron una reduccion significativa de NAA/Cr en el coliculo inferior derecho comparados con los sujetos control. Los datos metabolicos en el coliculo inferior derecho se correlacionaron con los items emocionales de las alucinaciones auditivas. Conclusiones. La contribucion del coliculo inferior a las bases neuronales de las alucinaciones auditivas es particularmente relevante para el coliculo inferior derecho y se centra en el componente atencional-emocional de este sintoma.

[Results of the percutaneous retrograde embolization as the first choice in the treatment of varicocele]. / Resultados de la embolización retrógrada percutánea como primera opción en el tratamiento del varicocele.

There is evidence that early varicocele treatment decreases testicular damage. The minimally invasive techniques such as laparoscopic varicocelectomy, antegrade sclerotherapy and percutaneous retrograde embolisation, are acquiring greater significance in the treatment of this disease. Since 1994, a series of 51 children, aged 7-16 years (mean, 12.9 years), with left-sided varicocele grades 2 (47%) and 3 (53%) were treated in our institution by percutaneous retrograde embolisation using coils. The right basilica vein was the most widely used (70%) followed by the right femoral vein. Seven children (13.7%) had complications: perforation of internal spermatic vein was the most frequent and treated conservatively. No child presented hydrocele after radiological procedures. Embolisation was accomplished succesfully at the first attempt in 35 (68.6%) of the 51 children and in 45 (88.2%) after a second embolisation. The follow-up ranges from 7 months to 5 ? years (mean, 1.8 years). The patients were monitored with clinical and doppler ultrasound examination 3, 6 and 12 months after the treatment. Retrograde embolisation is a safe and efficient minimally invasive treatment for correcting varicoceles in children. We performed retrograde embolisation as first choice of varicocele treatment in children; a second embolisation or conventional surgery for primary failure or late recurrence should be considered.

Resultados de la embolización retrógrada percutánea como primera opción en el tratamiento del varicocele / Results of the percutaneous retrograde embolization as the first choice in the treatment of varicocele

Existe evidencia científica de que el tratamiento precoz del varicocele disminuye el daño testicular. Las técnicas mínimamente invasivas como la varicelectomía laparoscópica, la escleroterapia anterográda y la embolización retrógrada, están adquiriendo mayor relevancia en el tratamiento de esta patología. Entre 1994 y 2008 hemos tratado a 51niños afectos de varicocele izquierdo grado 2 (47%) y 3 (53%) mediante embolización retrógrada percutánea con coils. La edad media fue de 12,9 años (rango 7-16 años). La vena basílica derecha fue la vía de acceso más usada (70%) seguida de la femoral derecha. El seguimiento medio ha sido de 1 año y 8 meses, con un rango de 7 meses a 5 años y medio. En 7 niños (13,7%) se presentó algún tipo de complicación, siendo la más frecuente la perforación de la vena espermática con extravasación de contraste, que se trató de forma conservadora. Ningún niño presentó hidrocele tras el procedimiento radiológico. Una primera embolización resolvió el 68,6% de los varicoceles y el 88,2% tras una segunda embolización. Los controles post-embolización consistieron en una revisión clínica y la realización de eco doppler testicular al mes, tres y seis meses. La embolización retrógrada percutánea es una opción terapéutica mínimamente invasiva segura y eficaz de tratamiento del varicocele en el niño. Nosotros la indicamos como primera opción terapéutica para el tratamiento del varicocele en la edad pediátrica, reservando una segunda embolización o la varicelectomía laparoscópica para los fracasos del primer procedimiento o las recidivas (AU)

There is evidence that early varicocele treatment decreases testicular damage. The minimally invasive techniques such as laparoscopic varicocelectomy, antegrade sclerotherapy and percutaneous retrograde embolisation, are acquiring greater significance in the treatment of this disease. Since 1994, a series of 51 children, aged 7-16 years (mean, 12.9years), with left-sided varicocele grades 2 (47%) and 3 (53%) were treated in our institution by percutaneous retrograde embolisation using coils. The right basilica vein was the most widely used (70%) followed by the right femoral vein. Seven children (13.7%) had complications: perforation of internal spermatic vein was the most frequent and treated conservatively. No child presented hydrocele after radiological procedures. Embolisation was accomplished succesfully at the first attempt in 35(68.6%) of the 51 children and in 45 (88.2%) after a second embolisation. The follow-up ranges from 7 months to 5 ? years (mean, 1.8 years).The patients were monitored with clinical and doppler ultrasound examination 3, 6 and 12 months after the treatment. Retrograde embolization is a safe and efficient minimally invasive treatment for correcting varicoceles in children. We performed retrograde embolisation as first choice of varicocele treatment in children; a second embolisation or conventional surgery for primary failure or late recurrence should be considered (AU)

[Treating iatrogenic pneumothorax with small-bore chest tube]. / Drenaje de neumotórax iatrogénico con catéter de calibre pequeño.

OBJECTIVE: To evaluate the feasibility of small-bore chest tube placement to treat pneumothorax caused by percutaneous procedures. MATERIAL AND METHODS: Between November 2004 and July 2006 we performed 151 interventional chest procedures (127 biopsies and 24 radiofrequency ablations) in 131 patients (25 women and 106 men; mean age, 63 years, range, 36-83 years). Fine needles (21-25 G) were used in 70 procedures and large core needles (14-20 G) were used in the remaining 81. Pneumothorax occurred in 16 diagnostic procedures (13 of these were treated with small-bore catheter placement) and in two radiofrequency procedures (both cases were treated with small-bore catheter placement). Chest tubes were placed immediately after pneumothorax occurred in all cases because the pneumothorax was greater than 20% or caused symptoms or occurred in patients with emphysema. RESULTS: Chest tubes were successfully placed without incidents in all cases and a Heimlich valve evacuated the air completely. Mean hospital stay was 43 hours (range, 24-72 hours). It was not necessary to place a larger-bore chest tube in any case. CONCLUSION: Small-bore chest tube placement is the treatment of choice for iatrogenic pneumothorax greater than 20% or less than 20% when symptomatic or occurring in patients with emphysema. The procedure is easy, effective, and well tolerated; furthermore, it shortens the hospital stay. The effectiveness of the procedure makes it possible to safely perform percutaneous procedures on patients with emphysema or difficult lesions and to finish an interventional procedure when pneumothorax occurs.

Drenaje de neumotórax iatrogénico con catéter de calibre pequeño / Treating iatrogenic pneumothorax with small-bore chest tube

Objetivo: evaluar la utilidad del drenaje de neumotórax con catéter de calibre pequeño tras la punción de lesiones torácicas. Material y métodos: desde noviembre de 2004 hasta julio de 2006 se realizaron 151 punciones torácicas en 131 pacientes (106 varones y 25 mujeres) con una media de edad de 63 años (36-83 años). Con fines diagnósticos se hicieron 127 punciones y los restantes 24 fueron tratamientos de termocoagulación con radiofrecuencia (RF). Se realizaron 70 punciones con aguja fina (21-25G) y 81 con aguja gruesa (14-20G). En los procedimientos diagnósticos se produjeron 16 neumotórax y se drenaron 13, y en los de RF hubo 2 neumotórax, y se drenaron ambos. El drenaje en todos los casos se realizó inmediatamente después de producirse, porque eran 20 % o presentaban síntomas, o siendo 20 % eran pacientes con enfisema. Resultados: en todos los pacientes pudo colocarse el catéter de drenaje sin incidencias, resolviendo el neumotórax con una válvula de Heimlich. El tiempo máximo de ingreso fue de 72 h, con una media de 43 h. En ningún caso se precisó colocar posteriormente un catéter de mayor calibre. Conclusión: el drenaje de neumotórax con catéter de calibre pequeño tras un procedimiento intervencionista torácico, es la técnica de elección cuando un neumotórax es 20 %, o el paciente está sintomático o tiene enfisema, porque su colocación no es difícil, es resolutivo, bien tolerado y acorta la estancia hospitalaria. Su resolución rápida permite puncionar pacientes con enfisema o lesiones difíciles con mayor seguridad y posibilita finalizar un procedimiento intervencionista si durante su realización se produce el neumotórax (AU)

Objective: to evaluate the feasibility of small-bore chest tube placement to treat pneumothorax caused by percutaneous procedures. Material and methods: between November 2004 and July 2006 we performed 151 interventional chest procedures (127 biopsies and 24 radiofrequency ablations) in 131 patients (25 women and 106 men; mean age, 63 years, range, 36-83 years). Fine needles (21-25 G) were used in 70 procedures and large core needles (14-20G) were used in the remaining 81. Pneumothorax occurred in 16 diagnostic procedures (13 of these were treated with small-bore catheter placement) and in two radiofrequency procedures (both cases were treated with small-bore catheter placement). Chest tubes were placed immediately after pneumothorax occurred in all cases because the pneumothorax was greater than 20 % or caused symptoms or occurred in patients with emphysema. Results: chest tubes were successfully placed without incidents in all cases and a Heimlich valve evacuated the air completely. Mean hospital stay was 43 hours (range, 24-72 hours). It was not necessary to place a larger-bore chest tube in any case. Conclusion: small-bore chest tube placement is the treatment of choice for iatrogenic pneumothorax greater than 20 % or less than 20 % when symptomatic or occurring in patients with emphysema. The procedure is easy, effective, and well tolerated; furthermore, it shortens the hospital stay. The effectiveness of the procedure makes it possible to safely perform percutaneous procedures on patients with emphysema or difficult lesions and to finish an interventional procedure when pneumothorax occurs (AU)

Evaluación de la arteriopatía de los miembros inferiores por tomografía computarizada multidetector comparada con la angiografía por sustracción digital / The evaluation of lower limb arteriopathy by multidetector computed tomography compared with digital subtraction angiography

Objetivos. Evaluar la eficacia diagnóstica de la angiografía por tomografía computarizada multidetector (ATCM) en la arteriopatía de miembros inferiores (MMII), comparándola con angiografía por sustracción digital (ASD). Material y métodos. Se estudiaron 24 pacientes con arteriopatía de MMII. Se realizaron ATCM (4 detectores) y ADS realizando doble lectura entre las dos técnicas. Los territorios vasculares se dividieron para facilitar el análisis. Se calcularon sensibilidad (S), especificidad (E), prevalencia, valor predictivo positivo y negativo (VPP, VPN) y concordancia (test de Kappa). En arterias de tercera porción se estudió el rendimiento diagnóstico del ATCM realizando una curva ROC. Resultados. El estudio ATCM para la evaluación de la patología arterial mostró: una S menor en el estudio de la arteria ilíaca primitiva y arteria ilíaca interna (S: 0,65 y 0,71) con E de 0,94 y de 1; en los demás territorios vasculares obtuvimos S próximas a 1, disminuyendo algo la E. La concordancia fue muy alta (kappa entre 0,62 y 1) en todos los territorios estudiados. La ATCM mostró más longitud de vaso que la ASD. En la tercera porción el mejor rendimiento diagnóstico (ROC) se obtuvo en la lectura de vasos patológicos. Conclusión. La ATCM presentó alta fiabilidad en el estudio de la arteriopatía de MMII, con alta concordancia respecto a la ASD. En vasos tortuosos la ATCM visualiza mal las lesiones, en cambio en vasos rectos y en tercera porción el estudio con ATCM visualiza más segmentos vasculares

Objectives. To evaluate the diagnostic efficacy of multidetector computed tomography angiography (MDCTA) in lower limb arteriopathy (LLA) by comparing it with digital subtraction angiography (DSA). Material and methods. Twenty-four patients with LLA were studied. All patients underwent MDCTA (four detectors) and DSA, with double reading between the two techniques. Vascular territories were divided to facilitate analysis. Sensitivity (S), specificity (Sp), prevalence, positive and negative predictive values (PPV, PNV), and concordance (Kappa test) were evaluated. In third-portion arteries, the diagnostic performance of MDCTA was evaluated using an ROC curve. Results. MDCTA study to evaluate arterial pathology showed: Lower sensitivity in the study of the internal iliac artery (S: 0.65 and 0.71) with Sp 0.94 and 1. In the other vascular territories, S approached 1, with a slight decrease in Sp. Concordance with DSA was very high (kappa between 0.62 and 1) in all of the territories studied. MDCTA showed greater vessel longitude than DSA. In the third portion, the best diagnostic performance (ROC) was obtained in the reading of pathological vessels. Conclusion. MDCTA was highly reliable in the study of LLA, with high concordance with DSA. In tortuous vessels, MDCTA depicted the lesions poorly; however, in straight vessels and third-portion vessels, MDCTA showed more vascular segments

[The evaluation of lower limb arteriopathy by multidetector computed tomography compared with digital subtraction angiography]. / Evaluación de la arteriopatía de los miembros inferiores por tomografía computarizada multidetector comparada con la angiografía por sustracción digital.

OBJECTIVE: To evaluate the diagnostic efficacy of multidetector computed tomography angiography (MDCTA) in lower limb arteriopathy (LLA) by comparing it with digital subtraction angiography (DSA). MATERIAL AND METHODS: Twenty-four patients with LLA were studied. All patients underwent MDCTA (four detectors) and DSA, with double reading between the two techniques. Vascular territories were divided to facilitate analysis. Sensitivity (S), specificity (Sp), prevalence, positive and negative predictive values (PPV, PNV), and concordance (Kappa test) were evaluated. In third-portion arteries, the diagnostic performance of MDCTA was evaluated using an ROC curve. RESULTS: MDCTA study to evaluate arterial pathology showed: Lower sensitivity in the study of the internal iliac artery (S: 0.65 and 0.71) with Sp 0.94 and 1. In the other vascular territories, S approached 1, with a slight decrease in Sp. Concordance with DSA was very high (kappa between 0.62 and 1) in all of the territories studied. MDCTA showed greater vessel longitude than DSA. In the third portion, the best diagnostic performance (ROC) was obtained in the reading of pathological vessels. CONCLUSION: MDCTA was highly reliable in the study of LLA, with high concordance with DSA. In tortuous vessels, MDCTA depicted the lesions poorly; however, in straight vessels and third-portion vessels, MDCTA showed more vascular segments.

Magnetic resonance myelography evaluation of the lumbar spine end plates and intervertebral disks.

PURPOSE: To evaluate the value of magnetic resonance (MR) myelography in the evaluation of intervertebral disk and end-plate degenerative changes in the lumbar spine. MATERIAL AND METHODS: Conventional MR and MR myelography examinations were performed in 150 consecutive patients (69 F and 81 M, mean age 45+/-15 years, range 18 89). Sagittal T1 and T2-weighted TSE images were compared to MR myelography obtained with a multishot-TSE-T2-weighted sequence (4000/250/fat suppression). Coronal, sagittal, and both oblique MR myelography projections were obtained. Image analysis was carried out independently by two radiologists who categorized lumbar disks into normal, degenerated, or edematous; and vertebral end plates into normal, edematous, or with fatty changes. The proportions were statistically compared at every lumbar intervertebral level. RESULTS: There was good agreement in the classification of disk disease (Kappa: 0.8-0.9). MRI detected a larger number of disk degeneration and end-plate fatty metamorphosis, while the MR myelography technique depicted a larger number of edematous disks and end plates. CONCLUSION: MR myelography was of limited value in detecting the same vertebral end-plate changes observed in MRI, although with similar findings in disk disease. However, the higher detection of edema changes by MR myelography should be analyzed prospectively, as it could be more sensitive than conventional MR sequences.

Endoprótesis fenestrada para tratamiento de aneurisma de aorta yuxtarrenal / Fenestrated stent-grafts to treat juxtarenal aortic aneurysms

Introducción. El uso de prótesis endovasculares ha supuesto una gran aportación para el tratamiento de aneurismas en pacientes de alto riesgo. Presentamos un caso de tratamiento de aneurisma yuxtarrenal mediante endoprótesis con fenestraciones para las arterias renales. Caso clínico. Se trata de un paciente de 60 años de edad, al que se le diagnosticó de aneurisma de aorta durante la realización de cateterismo cardíaco. Como patología asociada destacamos la existencia de cardiopatía isquémica grave con angina inestable sin posibilidades de revascularización miocárdica ni angioplastia. Fue intervenido quirúrgicamente de colectomía total por colitis ulcerosa. Estas dos circunstancias condicionaban un alto riesgo general y local para la cirugía arterial directa del aneurisma. En el estudio preoperatorio mediante tomografía axial computarizada y arteriografía se comprobó que el cuello subrrenal era de tan sólo 3 mm, por lo que se completó el estudio para el tratamiento mediante una endoprótesis fenestrada. Mediante abordaje femoral bilateral se procedió a colocar una prótesis fenestrada Zenith Cook ZFEN-1000 de 28 mm de diámetro proximal, 24 mm de diámetro distal y una longitud de 109 mm, con una escotadura para la arteria mesentérica superior, y dos fenestraciones para las arterias renales. Se concluyó con dos extensores rectos ESLE-55-24 Zenith Cook que se fijan a la bifurcación aórtica. El procedimiento finalizó con éxito, sin que se apreciaran fugas en los controles intra y postoperatorio. Conclusión. El uso de endoprótesis fenestradas para el tratamiento de aneurismas yuxtarrenales es un procedimiento factible y útil, cuyos resultados a largo plazo todavía no se conocen bien (AU)

MR-myelography as an adjunct to the MR examination of the degenerative spine.

Our objective was to analyse the usefulness of single-slice MR-myelography images as a complementary test to conventional MR of the spine in patients with clinically suspected degenerative spine disease. A prospective analysis of 1022 consecutive patients studied with conventional MR and MR-myelography (four acquisitions: one coronal plane, one sagittal plane, and two oblique lateral, right and left planes) examinations was performed. Conventional MR and MR-myelography studies were classified as positive when morphological or structural alterations were noted. Positive MR-myelography information was also categorized as relevant if findings were considered important and radiologically significative to the final diagnosis (either by increasing the radiologists confidence in the diagnosis or because the findings were not observed in the conventional study). Other positive findings were considered non- relevant. There were 62% cases considered positive in the MR-myelography examination. Of them, 3% revealed no alterations on the conventional MR examination. Of the negative MR-myelography studies, 75% had a positive conventional MR examination. Considered as diagnostic techniques, their Kappa concordance was poor. However, MR-myelography complemented the information obtained with the conventional MR examination of the spine, this information being relevant to the final MR diagnosis in 22% of the total number of cases. The contribution of MR-myelography was not different in the three spinal levels. In conclusion, MR-myelography complements the information obtained with conventional MR in a large number of cases.

Cognitive impairment: classification by 1H magnetic resonance spectroscopy.

1H magnetic resonance spectroscopy (MRS) allows accurate and non-invasive in vivo metabolic study, and is a useful tool for the diagnosis of different forms of dementias. Cognitive impairment pathologies have been almost exclusively studied with MRS by comparison with healthy without a global comparison amongst Alzheimer disease (AD), vascular dementia, mild cognitive impairment (MCI) and major depression patients with cognitive impairment. Whereas decrease of N-acetylaspartate (NAA) and increase myo-Inositol (mI) at different brain locations by 1H MRS are common features of AD, Choline (Cho) alterations have been inconclusive. In our study, 64 patients with cognitive impairment were evaluated by 1H MRS using two echo times (31 and 136 ms). There were statistical differences between dementia (AD and vascular dementia) and non-dementia (MCI and depression) spectra at posterior cingulate gyrus. Cho/Cr, mI/Cr and NAA/Cr have been valuables for the differentiation amongst the different cognitive impairment entities. NAA/mI provides the best area under the ROC curve with the highest sensitivity (82.5%) and specificity (72.7%) in diagnosing AD. NAA/mI and mI/Cr ratios differed amongst the four cognitive impairment degenerative pathologies. Metabolic MRS differences found amongst patients with cognitive impairment entities can be useful to differentiate between AD, vascular dementia, MCI and depression.

Comparison of different injection forms in CT examination of the upper abdomen.

BACKGROUND: The optimal technique for administration of intravenous contrast medium in computed tomography (CT) remains controversial. Therefore, we analyzed the influence of variable-rate injection protocols. METHODS: A double-blind, parallel-group study was conducted in 60 patients studied with the same helical CT contrast-enhanced protocol. Patients were randomly distributed into three groups: monophasic (123 mL at 2.5 mL/s), biphasic (123 mL, 60 mL at 1.5 mL/s and then 63 mL at 2.5 mL/s), and sigmoid (0.6 mL/s ending at 2.5 mL/s). Contrast-enhancement efficacy was evaluated by attenuation coefficient measurements. RESULTS: The monophasic injection protocol produced a statistically higher liver, inferior vena cava, and portal enhancement than did the low-high biphasic and sigmoid protocols. The biphasic protocol produced a statistically higher enhancement in the superior aorta. The enhancement obtained with the monophasic protocol was always higher than or equal to those obtained with the biphasic protocol in all measurement protocols except in the superior aorta and the aortic bifurcation. CONCLUSIONS: A monophasic injection produces better parenchymal and venous enhancement. When arterial enhancement is important, a low-high biphasic protocol can be used. A sigmoid protocol, with the parameters used in our series, is significantly less effective.

Effect of storage on fructan and fructooligosaccharide of onion (Allium cepa L.).

The purpose of this study was a comparative examination of the fructan and fructooligosaccharide (FOS) content of different varieties of onions (Allium cepa L. cv. Sturon, Hysam, Durco, Grano de Oro, and Caribo) and the changes produced during their commercial storage. In fresh onions, the Grano de Oro variety presented a remarkably different behavior, showing low contents of total fructans and FOS and high levels of reducing sugars. In the other varieties, Sturon, Hysam, Durco, and Caribo, fructans were the main carbohydrates, the lowest polymerized FOS being the major oligomer. Storage period caused in these varieties important increased levels of free fructose attributed to fructan hydrolysis. Maleic hydrazide treatment had no significant effect in avoiding the hydrolysis of fructans during storage conditions for the Sturon variety. Varieties with >16% dry matter or 15% soluble solids contents could be stored for 6 months at 0 degrees C and 60-65% relative humidity.

MR imaging of Baker cysts --prevalence and relation to internal derangements of the knee.

RATIONALE AND OBJECTIVES: To evaluate the prevalence of popliteal cysts in patients studied with magnetic resonance (MR) imaging. Cyst presence and volume will be related to other internal derangement of the knee. MATERIALS AND METHODS: Three hundred and eighty-two consecutive patients with a MR study of the knee were included. Images were obtained in the three spatial orthogonal planes and evaluated through consensus. Four categories were established for the Baker cyst and synovial fluid (absence, minimum, moderate and massive), and the presence of meniscal, cruciate ligaments and cartilage lesions were recorded. Statistical analysis was carried out with bivariate analysis (chi(2) of Pearson and Gamma tests). RESULTS: From the 382 patients, 145 had Baker cysts (38.0%). Cyst content was minimum in 99, moderate in 34 and massive in 12. Joint effusion was observed in 269 patients (70.4%), being minimal in 140 patients, moderate in 119 and massive in ten. Meniscal lesions were observed in 195 patients (51%), while 58 patients (15%) had a cruciate ligament lesion. Baker cyst had a statistically significant direct relationship with the presence and quantity of synovial fluid (P=0.002) and with the presence and type of meniscal lesion (P=0.01) but not with cruciate ligaments or cartilage lesions. CONCLUSIONS: The prevalence of Baker cysts in MR studies of the knee is high. Its presence and volume are related to the quantity of synovial fluid, and to the presence and severity of meniscal lesions.

[Value of MR myelography in the diagnosis of the spine disorders]. / Utilidad de la mielografía mediante resonancia magnética en el diagnóstico de las enfermedades de la columna vertebral.

To evaluate the utility of myelography obtained with MR imaging (MR-myelography) as a complementary tool in patients studied with a conventional MR examination of the spine. 275 consecutive patients were included. All of them were studied with MR-myelography in 2 planes, coronal and sagittal, with a turbo spin-echo single-shot technique, as a complement to a conventional MR study of the spine; 130 were males and 145 women, with ages ranging from 20 to 71 years (mean, 45 years). The analyzed variables were age, sex, vertebral segment studied, alteration of the dural sac, intradural nerve roots, emergent roots, and presence of intradural lesions, meningeal cysts, and spinal stenosis. The added value of MR-myelography regarding conventional MR was categorized. MR-myelography obtained new information in 88 cases (32%), being considered irrelevant information in 42 cases and relevant in 46 cases (16.7% of all cases) (amputations of the emergent roots and alterations of the intradural roots). MR-myelography did not contribute to any type of additional information to the conventional MR study in 187 cases (68% of all studies). MR-myelography is a rapid acquisition technique that supplements the conventional MR study of the spine, contributing with relevant new information in the analysis of the spine diseases 16.7% of cases.

Primary epiploic appendagitis: US and CT findings.

A retrospective review is presented of seven cases of epiploic appendagitis, with surgical confirmation in one case. The main clinico-analytical data and the US and CT findings are described, as well as the histopathologic features in the sole case that underwent surgical resection. We also calculated the frequency of this entity in patients undergoing emergency abdominal US on clinical suspicion of diverticulitis. In all seven cases the clinico-analytical evidence was nonspecific (localized acute abdominal pain and slight leukocytosis), mimicking in six cases the clinical presentation of sigmoid diverticulitis and in one case that of acute appendicitis. US imaging findings were characteristic: a hyperechoic mass localized under the point of maximum pain, adjacent to the anterior peritoneal wall and fixed during deep breathing. In none of the cases did color Doppler US show flow. CT findings were also typical and showed a mass with a peripheral hyperattenuated rim surrounding an area of fatty attenuation. Overall 7.1 % of patients investigated to exclude sigmoid diverticulitis finally showed findings of primary epiploic appendagitis. Primary epiploic appendagitis thus shows characteristic US and CT findings that allow its diagnosis and follow-up. This entity is much more frequent than previously reported, especially in patients referred for US to exclude sigmoid diverticulitis.