患儿，男，１．５岁。入院前４０余天无明显诱因出现排尿淋漓不尽，次数增多，７～８次／ｄ，每次尿量少，有时下腹膨胀，无尿急、尿痛、血尿。入院前２０ｈ出现排尿困难加剧，下腹膨胀明显。拟诊尿潴留收住院。直肠指检：前列腺Ⅲ度肿大，表面欠平坦，有结节感，部分囊性感。 Children, male, 1.5 years old. More than 40 days before admission there is no obvious incentive urinary dripping, the number increased, 7 to 8 times / d, each urine less, and sometimes lower abdomen expansion, no urgency, dysuria, hematuria. 20h before admission, dysuria increased exacerbation of abdominal distention. The proposed diagnosis of urinary retention admitted to hospital. Rectal examination: Ⅲ degree enlarged prostate, the surface is flat, nodular, partial cystic.