抄録
膀胱炎症性偽腫瘍は自然退縮もありうる良性の増殖性疾患である.病理所見では炎症細胞浸潤と繊維芽細胞の増殖が特徴的であるが,軽度の核分裂像と核の多形性を認めるため悪性疾患との鑑別が困難な症例が存在する.特に肉腫との鑑別疾患では炎症性偽腫瘍を念頭に置き過大な手術を施行しないよう注意する必要がある.
On September 25^<th>, 2003, a 39-year-old man complained of asymptomatic gross hematuria. He was admitted to a nearby hospital and evaluated. Cystoscopy revealed a non-papillary broad base tumor in the anterior wall of the bladder. On October 2^<nd>, a TUR-Bt was performed. The pathological diagnosis was difficult to determine because mitosis and nuclear pleomorphism were apparent. He next came to our hospital for further evaluation. We diagnosed his condition as an inflammatory pseudotumor of the bladder because fibroblasts and inflammatory cells had increased; however, we did not see abnormal nuclear mitosis or severe pleomorphism. Although we did not perform a complete TUR-Bt, the mass regressed spontaneously and did not reoccur. The presence of mitosis and mild nuclear pleomorphisms make certain cases difficult to diagnose as inflammatory pseudotumors. Inflammatory pseudotumors are generally considered benign, and some cases regress spontaneously. It is important that we are able to identify and characterize these pseudotumors in order to avoid more invasive surgeries whenever possible.
