Results For 12 CRDA cases with severe hydronephrosis,BUS was diagnostic in 9 cases and suggestive in 2 cases,while IVP was only suggestivc in 4 cases;

• 11例轻-中度积水型重肾,B超对10例作出诊断,而IVP对5例作出诊断,3例提示性诊断;