92歳,男.主訴は尿閉.X線検査で,陰茎部に一致した多発性の石灰化像があった.腎不全は腎後性閉塞が原因ではないかと推測された.亀頭包皮炎による包皮口の閉鎖,それに引き続く尿閉及び包皮結石の診断にて,緊急に包皮背面切開術,結石除去が行われ,尿道カテーテルが留置された.術後,腎機能は速やかに回復し,スムーズな自尿が可能になった.この症例により,高齢者の包茎に対する手術治療の必要性を再認識させられたThe patient was a 92-year-old male whose chief complaint was urinary retention. The X-ray film showed multiple overlapping calcification shadows in the penile region. Renal insufficiency was speculated to be due to post-renal obstruction. Under the diagnoses of closure of the preputial orifice by balanoposthitis followed by urinary retention and preputial calculi, an urgent dorsal incision of the prepuce was made. Then, stone removal and indwelling catheter placement were performed. Renal function recovered soon after the operation, and the patient could urinate freely without catheterization. This case reminds us of the significance of surgical treatment for phimosis in elderly patients.