This is failure of the anal opening to canalize and is the commonest cause of intestinal obstruction in the newborn. It presents with a wide variation in anatomical anomalies.

Clinical Features

There is failure to pass meconium, or may pass meconium per urethra or vagina.


  • Invertogram
  • Check for other anomalies


  • Surgical management best at specialized facility even for apparently simple malformations.
  • Detailed investigations will be performed.
  • Definitive surgical intervention, which may range from minor anuloplasty (dilatation, incision) to more complicated pull through procedures at the appropriate facility.
    • Continued dilatation at home
    • Sitz baths
    • Colostomy closure if needed
  • Counselling and attending to associated conditions.