has_part has part has part characteristic of inheres in inheres in has modifier Abnormal renal pelvis morphology Fetal pyelectasis HP:0010945 SNOMEDCT_US:430035004 MSH:D058536 Mild fetal hydronephrosis UMLS:C2317073 2011-01-16T03:36:31Z Mild foetal hydronephrosis Foetal pyelectasis The renal pelvis is the part of the kidney that collects urine. Fetal pyelectasis is a prenatal ultrasound finding that is diagnosed with enlargement of the renal pelvis from 4 to 10 millimeters. In many cases, fetal pyelectasis resolves spontaneously. Note that dilatation of the renal pelvis to more than 10 mm is referred to as severe pyelectasis or hydronephrosis. Measurements less than 5mm are normal, should not be designated as pyelectasis, and should not be reported (PMID:16100637). Foetal renal pelvic dilatation Mild pyelectasis is defined as a hypoechoic spherical or elliptical space within the renal pelvis that measures at least 5mm and not more than 10 mm. The measurement is taken on a transverse section through the fetal renal pelvis using the maximum anterior-to-posterior measurement. Fetal renal pelvic dilatation Fetal ultrasound soft marker Abnormal fetal genitourinary system morphology abnormal increased size renal pelvis