魚骨による膀胱周囲肉芽腫

PERIVESICAL GRANULOMA CAUSED BY A FISH BONE:A CASE REPORT

　60歳，男性．排尿時痛と下腹部痛を主訴に来院．CT，超音波検査，内視鏡所見より，尿膜管疾患を疑い開腹術を施行した．摘出した腫瘤内に魚骨を認めた．腫瘤は膀胱周囲肉芽腫であった．

A 60-year-old man complained of bladder irritability and lower abdominal pain. CT scan, ultrasonogra-phy and cystoscopy showed a mass at the dome of the bladder. Biopsy did not reveal malignant tissue. The patient successfully underwent removal of the mass with partial cystectomy. The mass as large as a hen's-egg was firmly adherent to the dome of the bladder. An ileal loop and the omentum were involved in the mass. Cut-section of the mass showed a fish bone. Histologically the mass was granuloma caused by a foreign body. A fish bone taken orally may have penetrated the ileal wall and reached the bladder wall.