A case of diverticular stones in the male anterior urethra with retrocaval ureter is reported. A 26-year-old man visited our hospital for examination, who had experienced spontaneous stone discharge a few days earlier. Computed tomographic (CT) scan with ureteral catheterization and urethrography revealed a retrocaval ureter and urethral diverticular stones. Resection of urethral diverticulum with 7 stones and right ureteroplasty were performed. The urethrography and drip infusion pyelography (DIP) 9 months after operation showed no abnormal findings. The largest stone was 28 x 22 x 20 mm in size and 20 g in weight. The main components were ammonium dihydrogen-urate (70%), carbonate apatite and struvite. Histological feature of the epithelium of the urethral diverticulum indicated normal skin with hairs. Pathological diagnosis was para-urethral dermoid cyst. Our case is the 67th case of the male urethral diverticular stones and the first case of those with retrocaval ureter in Japan.
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机译：据报道一例男性前尿道憩室结石伴后腔输尿管。一名26岁的男子到我们医院接受检查，几天前曾经历自发性结石排出。计算机断层扫描（CT）扫描与输尿管导尿术和尿道造影显示了后腔输尿管和尿道憩室结石。切除7个结石的尿道憩室并进行右输尿管成形术。术后9个月的尿道造影和滴注肾盂造影（DIP）没有发现异常。最大的石头大小为28 x 22 x 20毫米，重量为20克。主要成分是尿酸二氢铵（70％），碳酸盐磷灰石和鸟粪石。尿道憩室上皮的组织学特征表明皮肤正常，有毛发。病理诊断为尿道旁皮样囊肿。我们的病例是日本第67例男性尿道憩室结石，首例具有后腔输尿管结石的病例。
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