Retroperitoneal Hibernoma: Exhibition of Three Case Reports and Literature Review

Hibernoma is a rare benign tumor that becomes from the vestiges of fetal brown adipose tissue. It can be located on different regions body, being tight most frequent. Retroperitoneal region approximately 9.4%. The first person to describe this histological type was Merkel. To present, there are only described 25 cases location. has slowly growth, so it normally asymptomatic, and usually presents doing compression structures. diagnose MRI best prove, although biopsy will provide definite diagnosis describing four possible variants. Immunochemistry MDM2, CDK4 p16 genes really important do differential with well-differentiated liposarcoma (WDLS). Only one extensive review hibernoma 170 published. But no literature specifically retroperitoneal region, purpose current study. Following we present three more have treat our Mesenchymal Tumours Unit revision previously