Fig. 3

Preoperative CT and schema. A Abdominal contrast-enhanced CT sagittal image, B schema. The tumor was located on the ventral side of pancreas. Transverse colon and transverse mesocolon were displaced dorsally and stomach and greater omentum were compressed ventrally by the tumor. Based on its localization and vascular supply, the tumor was considered to originate from the peripancreatic fat tissue and situated in the retroperitoneum