the degree of dilatation of the renal pelvis ( grades iii , iv , or v ) observed postnatally with sonography as well as the obstructive excretory pattern noted by renal isotope scanning were used as criteria to determine the need for early postnatal pyeloplasty ( performed in 25 patients ) , which relieved the obstruction and , in the majority of patients , improved renal structure and function .
C0227666
renal pelvis
C0022646
renal structure