酸性尿酸アンモニウム結石の2症例

Ammonium Acid Urate Urinary Stone:A Report of Two Cases

　酸性尿酸アンモニウム結石の2症例を経験した。症例1は，急激な体重減少をきたした若年女性の腎尿管結石で，体外衝撃波砕石術（ESWL）にて砕石された。症例2は，脊髄症による神経因性膀胱に起因する慢性膀胱炎の既往のある高齢の女性に発生した大きな膀胱結石で，経尿道的に摘出した。両者とも緩下剤を長期にわたり服用していた。再発の予防に，緩下剤の調節と膀胱炎のコントロールが必要であると考えられた。

Two female patients visited our hospital with urinary stone, consisted of ammonium acid urate (AAU). Case 1: a 25-year-old female who had a history of laxative abuse was treated by extracorporeal shock wave lithotripsy. Disinte-grated stones were consisted of AAU. Case 2: an 87-year-old woman was referred to our hospital for investigation of acute urinary retention. She suffered from chronic cystitis.The stone was located within the urethra, a tip of which was seen at the external urethral meatus. The calculus was subsequently dislodged from the urethra using forceps.