Idiopathic retroperitoneal fibrosis arising from peritoneal space: A case report and review of literature

Figure 1 Magnetic resonance imaging and 18F-fluorodeoxyglucose positron emission tomography images. A and B: Diffusion-weighted imaging (A) and delayed-enhancement (B) images of magnetic resonance imaging showed an irregular soft tissue with ill-defined boundary with the head of pancreas and the hepatic flexure of the colon; C and D: On 18F-fluorodeoxyglucose positron emission tomography images, increased uptake in the tumor with a maximum standardized uptake value of 10.3 was detected.

Figure 2 Pathological result. A: Idiopathic retroperitoneal fibrosis; B: Lymphoid plasma cell infiltration to the muscularis propria of the colon.