Retroperitoneal Lipoma Arising from the Urinary Bladder

Abstract

Retroperitoneal benign lipomas are extremely rare and represent about 2.9% of all primary retroperitoneal tumors. About 80% of the tumors in the retroperitoneal cavities are malignant neoplasms. We experienced a case of a retroperitoneal lipoma simulating an ovarian mature cystic teratoma. A diagnosis was correctly made by magnetic resonance imaging (MRI) prior to surgery, and a total tumorectomy was performed. The retroperitoneal lipoma was recognized to have arisen from the urinary bladder. Histological sections revealed a tumor consisting of typical adipose cells without atypia. These types of lipomas should be carefully followed-up because they often recur and undergo malignant transformations.

A benign psoas teratoma of the non‐pelvic retroperitoneal space: A case report

“…The present finding is very unusual since only two cases of retroperitoneal teratomas near the upper pole of the kidney have been reported (Tapper and Lack,; Chen et al,). It should also be noted that many of these are found much lower in the retroperitoneal space such as in the pelvic region (Ukita et al,).…”

Giant retroperitoneal lipoma in a child: clinical case

“…Забрюшинная липома может развиваться из жировой, соединительной, мышечной тканей, элементов лимфатической или нервной систем, из брыжейки, фасции Героты или мочеполового тракта [5,6]. Вследствие чрезвычайной редкости диагностика забрюшинных липом у детей врачами первичного звена весьма затруднена [1,2].…”

Staged management of giant bilateral perinephric adipocytic neoplasms

“…Retroperitoneal lipomas are an extremely rare finding and only diagnosed after thoroughly excluding liposarcoma on morphologic and molecular genetic grounds. There have been at least 40 cases in the English literature; some presented with giant abdominal tumors [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. The majority of the reports describe typical lipomas with pure adipocytes on histology.…”