單獨纖維瘤是一種罕見的腫瘤，最早的病例報告是在肋膜發現。單獨纖維瘤源自於CD34呈陽性之纖維間質組織母細胞。根據文獻記載，源自於膀胱之單獨纖維瘤非常稀少，當中有些病例以膀胱根除性手術來治療。我們報告一例巨大之膀胱單獨纖維瘤以下泌尿道症狀及排便習慣改變來表現。此病例以廣泛切除腫瘤之方式來治療。

Solitary fibrous tumors are rare neoplasms initially reported in the pleura and are known to originate from C D34-positive m esenchymal cells of a probable f ibroblastic type. To our knowledge, only limited cases of solitary fibrous tumors arising from the urinary bladder have been reported. Some of those underwent a radical cystectomy to cure this disease. Herein, we report on an elderly man with a huge solitary fibrous tumor who presented with lower urinary tract symptoms and a change of bowel habits; the tumor was successfully treated with wide excision.