PMC5658652_01
(A) Abdominal and (B) pelvic computed tomography confirming a retroperitoneal mass encasing the main abdominal vessels-mesenteric. Noted on the images are the renal and upper abdominal aorta (green arrow), the residual ascites with pigtail in situ (red arrow), and hydronephrosis with some ureteric obstruction (yellow arrow).
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F1
An abdominal and pelvic computed tomography (CT) showed a mildly enhancing soft-tissue mass lesion encasing the mesenteric renal vessels and partly encasing the upper abdominal aorta, and the pancreas was involved as well (Figure 1).
Hematoxylin and eosin stain showing fibrosis and inflammation (magnification 400x).
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F2
Histology of a CT-guided biopsy confirmed a diagnosis of idiopathic RPF (Figure 2).