The most common type of anorectal malformation is
The most common type of malformation involving the anal canal and rectum is anorectal agenesis, in which the rectum ends as a blind sac above the puborectalis muscle. The anal canal may form normally but does not connect with the rectum. This malformation is accompanied by various fistulas.
Imperforate anus
Anal agenesis
Anorectal agenesis
Rectal atresia
Embryology and abdominal wall layer