Prenatal US from 11 to 35 wk gestational age
Age of gestation (AG) is shown on the top left corner.
At 11 weeks gestation (WG), kidneys and bladder were normal.
At 17 WG, we found a mild bilateral pyelic dilation, with normal kidneys parenchymas, ureters, and bladder. There were no associated malformation or aneuploidy signs.
Upon follow-up, the mild dilation remained stable at 20, 25, 28 and 32 WG. Bowel, anal muscles, spine vertebra, and cord were normal. Amniocentesis was proposed, but not performed.
At 35 WG, the left pyelic dilation worsened, reaching 15 mm versus 10 mm on the right side.