Retroperitoneal Pleomorphic Liposarcoma Mimicking Adrenal Cancer in F-18 FDG PET/CT.

[pleomorphic liposarcoma]

Liposarcoma is the second most common type of soft tissue sarcoma , but pleomorphic liposarcoma is the least common subtype . We present the case of a 42 -year -old man who had experienced intermittent left flank pain for a month . A large soft -tissue mass was detected by ultrasonography in a local clinic , and he was referred for further evaluation . Positron emission tomography /computed tomography (PET /CT ) with F-18 fluoro-2 -deoxy-D-glucose (F-18 FDG ) showed intense uptake in the retroperitoneal mass , which mimicked an adrenal cancer . The patient underwent left radical nephroadrenalectomy , and the tumor was revealed to be a pleomorphic liposarcoma upon pathological examination . When there is a large retroperitoneal mass with intense F-18 FDG activity , the possibility of a pleomorphic liposarcoma should be considered .