Imaging of anorectal malformations in utero

Abstract

Purpose: To document the imaging findings suggestive of anorectal malformation (ARMs) on prenatal US and MRI.

Methods: Retrospective evaluation of the screening US and prenatal MRI exams of the rectum and ano-perineal region in normal fetuses and in patients with ARMs.

Results: Examples showing the normal rectal and anoperineal anatomy on prenatal US and MRI exams and the imaging findings observed in different types of confirmed ARMS.

Conclusions: Prenatal diagnosis of ARMs requires both a systematic evaluation of the fetal pelvis and perineum and an appropriate knowledge of its suggestive imaging findings.

Keywords: Anorectal malformation; Cloaca; Prenatal MRI; Prenatal US.