Pop-off mechanisms in fetal megacystis: extravasation, umbilical cord cyst, ureterocele and mega-ureter

UCC was associated with early-onset megacystis, normal AFI, other congenital anomalies and the highest prevalences of IUFD, while the occurrence of urinary extravasation was associated with an antenatal clinical picture characterised by severe megacystis, abnormal AFI and other congenital anomalies and associated with high rates of pregnancy termination and neonatal death. A mega-ureter/ureterocele mainly occurred in late-onset and isolated megacystis showing a thickened bladder wall, low prevalences of other congenital anomalies and highest survival rates.