Imperforate anus or anal atresia is a congenital anorectal malformation (ARM) where a normal anal opening is absent at birth. ARMs comprise of a broad spectrum of defects ranging from minor (e.g., membranous covering) to complex cloacal malformations

Anorectal malformation is the general term for a variety of diagnoses often referred to as imperforate anus. Patients with this diagnosis do not have a normal anal opening, but instead, a fistulous tract opens onto the perineum anterior to the anal

Anorectal and cloacal malformations are a broad mix of congenital abnormalities related to the distal rectum and anus. There is a male predominance with a prevalence of around 1:5,000 [1] for anorectal malformations (ARMs), whereas cloacal malformations