case_images: PMC4290073_01
case_images: Maximum intensity projection positron emission tomography (PET) image (a) showing the patchy retroperitoneal lesion with moderate to intense 18F-fluorodeoxyglucose (18F-FDG) uptake (arrows, maximum standardized uptake value-3.7). No other abnormal hypermetabolic focus is seen in the rest of the body. Coronal (b) and sagittal (c) PET/computed tomography images demonstrating 18F-FDG avid retroperitoneal soft tissue mass encasing the abdominal aorta (arrows)
case_images: IJNM-30-72-g001.jpg
case_images: PMC4290073_01_IJNM-30-72-g001.jpg
case_images: F1
case_images: PET/CT. PET/CT findings revealed a heterogeneously enhancing retroperitoneal soft tissue mass encasing the left ureter, aorta, left renal vessels, and left common iliac vessels, with heterogeneous 18F-FDG uptake [maximum standardized uptake value (SUVmax)-3.7] [Figures 1a-c and 2a-i].
case_images: Transaxial contrast-enhanced computed tomography (CT) images of the abdomen (a-c) showing heterogeneously enhancing retroperitoneal soft tissue mass extending from the level of superior mesenteric artery to left iliac region and encasing abdominal aorta, left renal vessels, left iliac vessels, and left ureter (arrows). On transaxial positron emission tomography (PET) (d-f) and PET/CT (g-i) images, heterogeneous 18F-fluorodeoxyglucose uptake is seen in the retroperitoneal mass (arrows)
case_images: IJNM-30-72-g002.jpg
case_images: PMC4290073_01_IJNM-30-72-g002.jpg
case_images: F2
case_images: PET/CT. PET/CT findings revealed a heterogeneously enhancing retroperitoneal soft tissue mass encasing the left ureter, aorta, left renal vessels, and left common iliac vessels, with heterogeneous 18F-FDG uptake [maximum standardized uptake value (SUVmax)-3.7] [Figures 1a-c and 2a-i].