SOLITARY FIBROUS TUMOR OF THE URINARY BLADDER: A CASE REPORT

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  • Wang Cong
    Department of Urology, National Hospital Organization Osaka National Hospital
  • Miyago Naoki
    Department of Urology, National Hospital Organization Osaka National Hospital Present address: Department of Urology, Higashiosaka City General Hospital
  • Harada Yasunori
    Department of Urology, National Hospital Organization Osaka National Hospital
  • Yasunaga Yutaka
    Department of Urology, National Hospital Organization Osaka National Hospital
  • Oka Toshitsugu
    Department of Urology, National Hospital Organization Osaka National Hospital

Bibliographic Information

Other Title
  • 膀胱に発生した孤立性線維性腫瘍の1例
  • 症例報告 膀胱に発生した孤立性線維性腫瘍の1例
  • ショウレイ ホウコク ボウコウ ニ ハッセイ シタ コリツセイ センイセイ シュヨウ ノ 1レイ

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Description

Solitary fibrous tumor (SFT) is one of the mesenchymal tumor usually occurs in the pleura. Extrapleural occurrence of SFT is uncommon. We herein report an extremely rare case of 72-year old man with SFT originated in the urinary bladder. The tumor was incidentally discovered as a mass of 8.5 mm in diameter by a pelvic MRI. Cystoscopy revealed the protruding submucosal tumor in the center of the trigon. Transurethral resection was carried out. Pathological examination revealed a tumor composed of spindle cells with rich vascularity surrounded by abundant collagen fibers. The immunohistochemical findings showed a strong positivity to CD 34 and relatively weak positivity to Bcl-2. MIB-1 index indicated less than 3%, thus the tumor was diagnosed as a solitary fibrous tumor. The patient has no evidence of disease 16 months after the surgery. The current case was the first report in Japan and the twelfth worldwide.

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