If a child was suspected to have each of the following diseases by ultrasound examination, such as renal duplication, renal hypoplasia, and severe renal injury, CTU could be selected as the first choice.

• 如疑有肾发育不良、重复肾输尿管畸、肾输尿管重度损伤等上尿路外科疾病,可首选CTU检查。