This month Sophie Lewis (Paediatric Surgery registrar and NOTF) is once again joined by Ewan Brownlee (Paediatric Urology Consultant Surgeon University Southampton General and NOTPD) and Marie-Klaire Farrugia (Paediatric Urology Consultant, Chelsea and Westminster NHS Foundation/West London Children's Hospital Alliance) to discuss antenatal urinary tract dilatation (UTD). We discuss the various diagnoses that can present in the antenatal period, how to investigate and manage these conditions.