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The Korean Journal of Pathology 2004;38(2): 129-131.
Solitary Fibrous Tumor of the Urinary Bladder: A Case Report.
Jong Sil Lee, Jeong Seok Hwa, Gyung Hyuck Ko, Jeong Hee Lee, Hwal Woong Kim
1Department of Pathology, Gyeongsang National University, College of Medicine, Jinju, Korea. hawk7023@chollian.net
2Department of Urology, Gyeongsang National University, College of Medicine, Jinju, Korea.
ABSTRACT
Solitary fibrous tumor (SFT) most commonly affects the pleura and these tumors have been recently reported to be found in unusual locations. We describe here a solitary fibrous tumor of the urinary bladder that was removed from a 79-year-old man having a history of gross hematuria and dysuria. Transabdominal ultrasonography showed a huge soft tissue mass in the urinary bladder. The cut surface of the tumor showed a grayish-white, hemorrhagic and gelatinous appearance. Necrosis was not found. Microscopically, the tumor showed a proliferation of spindle or ovoid cells that were intervened by a collagenous stroma. A variety of growth patterns was identified but the so-called patternless pattern was the predominant one. The spindle cells had almost no mitotic figures, and there was very little or no nuclear atypia. Immunohistochemical stains showed a strong reactivity for CD34 and a focal reactivity for bcl-2. The ultrastructure of the tumor cells showed mesenchymal-myofibroblastic traits.
Key Words: Solitary Fibrous Tumor; Urinary Bladder; CD34