title: 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.
authors.affiliation: Department of Obstetrics and Gynecology, Otsu Red-Cross, Otsu, Shiga, Japan;
authors.forename: Shingo
authors.initials: S
authors.lastname: Ukita
authors.forename: Masafumi
authors.initials: M
authors.lastname: Koshiyama
authors.forename: Megumi
authors.initials: M
authors.lastname: Ohnaka
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Miyagawa
authors.forename: Yukio
authors.initials: Y
authors.lastname: Yamanishi
authors.forename: Fumitomo
authors.initials: F
authors.lastname: Nishimura
authors.forename: Michikazu
authors.initials: M
authors.lastname: Nagura
authors.forename: Tomoko
authors.initials: T
authors.lastname: Kim
authors.forename: Masaya
authors.initials: M
authors.lastname: Hirose
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Shirase
authors.forename: Hisato
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ozasa