Stable findings at 31WG:
Bilateral megaloureters followed all the way from the renal pelvis to below the bladder. Bladder is identified thanks to the umbilical arteries at its borders drawing a Y shape. Bladder does not appear distended, no internal image of ureterocele.
Enlarged kidneys, with normal parenchyma: no thinning, no hyperechoic aspect.
A sharp eye may witness a separate pyelix at the lower pole of the right kindney on the axial US scan.
Oddly, calyces are non dilated and amniotic fluid remains normal, while oligohydramnios/anamnios might be expected in urinary obstacles.
Careful US examination reveals normal small bowel. The transverse large bowel is clearly seen, normal, non dilated. Fetal anal sphincter is normal (not shown).