患者　男 ,10岁。阵发性腰痛伴血尿 1d。体检 :右肾区轻度叩击痛 ,膀胱区无膨隆 ,无触痛 ,未触及肿块。阴茎发育正常 ,双睾丸等大。血常规 :正常。尿常规 :红血球 (+ + ) ,血小球少量 ,蛋白 (+ )。初诊 :血尿待查。B超所见 :右侧输尿管入口处见直径 2 .5cm的囊状液性暗区 ,暗区 Patient male, 10 years old. Paroxysmal back pain with hematuria 1d. Physical examination: mild percussion pain in the right kidney area, no swelling in the bladder area, no tenderness, no palpable mass. Normal penile development, double testis and other large. Blood: normal. Urine routine: red blood cells (+ +), a small amount of blood cells, protein (+). New diagnosis: hematuria pending investigation. B seen: the right ureter see the diameter of 2.5 cm cystic liquid dark area, dark area