Normal voiding does not exclude posterior urethral valves

摘要

A 6-week-old male infant with a prenatal diagnosis of bilateral hydronephrosis from the 20th week of gestation was seen for diagnostic workup. At 38 weeks of gestation, right and left renal pelvis anterior-posterior diameters measured 11 and 7 mm, respectively, with dilated calyces. Renal cortex thickness, amni-otic fluid volume and bladder volume were within normal limits. He was born at 39 weeks via an uncomplicated vaginal delivery, and urinated normally in the first hours of life, with no evidence of abdominal distension.