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Evaluamos el cambio del diametro del cuello en aneurismas de aorta abdominal tras la reparacion endovascular (REVA) y su relacion con el diametro de la endoprotesis implantada. Mediante tomografia axial computarizada multicorte y siguiendo un protocolo estandarizado, se estudiaron 98 pacientes con aneurisma de aorta abdominal que se sometieron a REVA. Se efectuo una valoracion preoperatoria y en el postoperatorio inmediato, asi como durante el seguimiento a los 6 meses, al ano y a los 2 anos. En las imagenes planares realizadas sobre la perpendicular del eje del vaso (corte axial real) se midio el cuello del aneurisma de adventicia a adventicia, 6 mm por debajo de la arteria renal mas caudal. Los diametros del cuello basales y durante el seguimiento se compararon con los de la endoprotesis. Para el analisis estadistico se utilizo un analisis de la varianza para medidas repetidas. Para examinar la correlacion entre el cambio del diametro del cuello y del diametro de la endoprotesis se uso el coeficiente de correlacion de Pearson. En el estudio preoperatorio el diametro medio del cuello fue de 22,38 mm (rango 16-32,5), de 23,35 mm (17-33,9) en el postoperatorio inmediato, de 24,35 mm (18,2-34,5) a los 6 meses, 24,36 mm (18-34,5) al ano y 24,39 mm (17,8-35,7) a los dos anos de seguimiento. El diametro medio del dispositivo fue de 24,08 mm (20-32). Se encontro un aumento significativo del diametro medio del cuello entre el control preoperatorio, postoperatorio inmediato y a los 6 meses. No se identifico un aumento significativo del diametro medio del cuello entre los 6 meses, el ano y los 2 anos del seguimiento. La sobredimension media basal de la endoprotesis fue de 1,7 mm, con una disminucion hasta –0,31 mm en el ultimo seguimiento. La dilatacion del cuello no supero significativamente el diametro de la endoprotesis en 83 casos (87,36%). El crecimiento del cuello del aneurisma se produjo durante los 6 primeros meses despues de la REVA. Entre los 6 meses y los 2 anos de seguimiento no se observo una variacion significativa del diametro del cuello. En la mayoria de los casos, la dilatacion del cuello del aneurisma no supero significativamente el diametro de la endoprotesis, guardando posiblemente este crecimiento una relacion con la presencia de la misma.

An enlargement of the infrarenal aneurysm neck occurred during the first 6 months after EVAR. No significant variation in neck diameter occurred between the 6-month and 2- year follow-up visits. In the majority of cases, dilation of the aneurysm neck does not significantly exceed stent-graft diameter and, therefore, is possibly related to the presence of the endograft. Nous avons evalue le changement de diametre du collet des anevrismes apres traitement endovasculaire (EVAR) et son rapport avec le diametre du stentgraft. Quatre-vingt-dix-huit patients presentant un anevrisme aortique abdominal traites par EVAR ont ete etudies par scanner selon un protocole standardise. Un examen preoperatoire et des controles en postoperatoire immediat, a six mois, un an, et deux ans ont ete realises. Le collet etait mesure d'adventice a adventice, 6 mm au-dessous de l'artere renale la plus basse, perpendiculairement a l'axe de l'artere (vraie coupe longitudinale). Les diametres de base et de suivi du collet etaient compares aux diametres des stentgrafts. Pour l'analyse statistique, une analyse de variance unidirectionnelle avec des mesures repetees etait employee. Le coefficient de correlation de Pearson etait employe pour examiner la correlation entre le changement de diametre du collet et le diametre du stentgraft. Le diametre moyen du collet etait de 22,38 mm (extremes 16-32,5) sur l'examen preoperatoire et de 23,35 mm (17-33,9) en postoperatoire immediat, de 24,35 mm (18,2-34,5) a six mois, de 24,36 mm (18-34,5) a un an, et de 24,39 mm (17,8-35,7) a deux ans. Le diametre moyen du dispositif etait de 24,08 mm (20-32). Une croissance significative du diametre moyen du collet etait trouvee entre les controles preoperatoire, postoperatoire immediat et a six mois. Il n'y avait aucune augmentation significative du diametre moyen du collet entre le suivi a six mois, un an, et deux ans. L’ oversizing moyen du stentgraft etait de 1,7 mm, diminuant a 0,31 mm au dernier suivi. La dilatation du collet n'a pas depasse de maniere significative le diametre du stentgraft dans 83 cas (87,36%). Un agrandissement du cou de l'anevrisme sous-renal s'est produit pendant les 6 premiers mois apres EVAR. Aucune variation significative de diametre du collet ne s'est produite entre les visites a six mois et deux ans. Dans la majorite des cas, la dilatation du collet anevrismal ne depasse pas de maniere significative le diametre du stentgraft et, en consequence, n'est probablement pas liee a la presence de l'endoprothese.

La neumonia organizada es una enfermedad pulmonar poco frecuente, con gran variabilidad en los hallazgos radiologicos, de la que hasta el momento existe un escaso numero de casos en la mayoria de los estudios publicados en la bibliografia. Hemos estudiado mediante tomografia computarizada de alta resolucion 34 casos con diagnostico histologico establecido de neumonia organizada valorando los diferentes patrones de presentacion. De estos casos, 25 fueron idiopaticos y 9 secundarios. Los hallazgos observados fueron: consolidaciones parenquimatosas (76%), vidrio deslustrado (59%), dilataciones bronquiales (53%), nodulos centrolobulillares (35%), engrosamientos septales (23%), signo del halo (15%) y signo del halo invertido (12%). Se observo una mayor presencia de engrosamientos septales y un menor numero de remisiones completas en los casos secundarios.

Organizing pneumonia is an uncommon lung disease with a wide variety of radiologic findings, few of which have been discussed in the literature. We performed high resolution computed tomography on 34 patients with a histological diagnosis of organizing pneumonia and studied the images they presented. Twenty-five of the cases were idiopathic and 9 secondary. The findings observed were parenchymal consolidation (76%), ground glass opacity (59%), bronchial dilatation (53%), centrilobular nodules (35%), septal thickening (23%), halo sign (15%), and reversed halo sign (12%). Secondary cases presented more findings of septal thickening and fewer complete remissions.

We assessed aneurysm neck diameter change after endovascular abdominal aortic aneurysm repair (EVAR) and its relationship to stent-graft diameter. Ninety-eight patients with abdominal aortic aneurysm who underwent EVAR were studied with multislice computed tomography following a standardized protocol. A preoperative study and immediate postoperative, 6-month, 1-year, and 2-year follow-up studies were performed. The aneurysm neck was measured from adventitia to adventitia, 6 mm below the lowermost renal artery, in planar images performed perpendicular to the vessel axis (real axial section). Baseline and follow-up neck diameters were compared with stent-graft diameters. For statistical analysis, a one-way analysis of variance with repeated measures was used. Pearson's correlation coefficient was used to examine the correlation between the change in neck diameter and stent-graft diameter. The average neck diameter was 22.38 mm (range 16-32.5) on the preoperative study and 23.35 mm (17-33.9) on the immediate postoperative, 24.35 mm (18.2-34.5) on the 6-month, 24.36 mm (18-34.5) on the 1-year, and 24.39 mm (17.8-35.7) on the 2-year follow-up. The mean device diameter was 24.08 mm (20-32). A significant increase in average neck diameter was found between the preoperative, immediate postoperative control, and 6-month control. There was no significant increase in the average neck diameter between the 6-month, 1-year, and 2-year follow-up. Baseline mean stent-graft oversizing was 1.7 mm, which decreased to -0.31 mm at latest follow-up. Dilation of the neck did not significantly exceed the endograft diameter in 83 cases (87.36%). An enlargement of the infrarenal aneurysm neck occurred during the first 6 months after EVAR. No significant variation in neck diameter occurred between the 6-month and 2-year follow-up visits. In the majority of cases, dilation of the aneurysm neck does not significantly exceed stent-graft diameter and, therefore, is possibly related to the presence of the endograft.

The aim of this study was to determine the correlation between the measurement of transverse diameter of the proximal neck on computed tomographic angiography (CTA) and graduated catheter aortography in patients who are candidates for endovascular graft placement in order to replace, if both measurements are equivalent, aortography for CTA alone. Preoperative dual-slice CTA and graduated catheter aortography were performed in 35 consecutive patients with infrarenal aortic aneurysm within 10 days. Transverse proximal neck diameters were measured on a true axial section on CTA reconstructions and on aortographic images, always 6 mm distal from the most inferior main renal artery. Mean, median, and standard deviation were obtained and the measurements correlated for each patient using Pearson's correlation and linear regression analysis. A significant difference in proximal neck transverse diameter measurements was found between graduated catheter aortography and CTA in all cases. CTA values were a mean of 1.74 mm higher than aortography values. Pearson's correlation indicates a strong correlation between both techniques, and a regression equation determines the predictive value of aortography on the basis of CTA values. Estimation of the transverse diameter of the proximal neck on aortography on the basis of that obtained on CTA allows us to affirm that CTA could be used as the sole method for the preoperative selection of appropriate endograft size in patients with infrarenal aortic aneurysm.