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Case Reports
. 2009 Jul 22;1(1):e13.
doi: 10.4081/rt.2009.e13.

Retroperitoneal lipoma arising from the urinary bladder

Shingo Ukita  1 , Masafumi Koshiyama, Megumi Ohnaka, Naoyuki Miyagawa, Yukio Yamanishi, Fumitomo Nishimura, Michikazu Nagura, Tomoko Kim, Masaya Hirose, Tomoyuki Shirase, Hisato Kobayashi, Hiroshi Ozasa
Affiliations
Case Reports

Retroperitoneal lipoma arising from the urinary bladder

Shingo Ukita et al. Rare Tumors. .

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.

Keywords: lipoma; magnetic resonance imaging.; ovarian mature cystic teratoma; retroperitoneum; urinary bladder.

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Conflict of interest statement

Conflict of interest: the authors reported no potential conflict of interests.

Figures

Figure 1
Figure 1
Retropelvic mass showed very high intensities on T1-(a) and T2-(b) weighted images that were the same intensity as fatty tissues. This mass was diagnosed as a retropelvic lipoma by observing the position of the uterine broad ligament (arrow), the round ligament (arrow), the uterine artery (arrow) and the lateral umbilical ligament (arrow).
Figure 2
Figure 2
Retropelvic lipoma after its removal.
Figure 3
Figure 3
Histological examination reveals an adipose tissue neoplasm without cytologic atypia.
See this image and copyright information in PMC

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