Congenital absence of the anus, i.e., the opening at the bottom end of the intestinal tract. [https://orcid.org/0000-0002-0736-9199]

An imperforate anus or anorectal malformations (ARMs) are birth defects in which the rectum is malformed. ARMs are a spectrum of different congenital anomalies which vary from fairly minor lesions to complex anomalies...