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Imperforate anus is a defect that is present from birth (congenital). The opening to the anus is missing or blocked. The anus is the opening to the rectum through which stools leave the body.
Anorectal malformation; Anal atresia
Causes, incidence, and risk factors
Imperforate anus may occur in several forms.
The problem rare. It is caused by abnormal development of the fetus. Many forms of imperforate anus occur with other birth defects.
Signs and tests
A doctor can diagnose this condition during a physical exam. Imaging tests may be recommended.
The infant should be checked for other problems, such as abnormalities of the genitals, urinary tract, and spine.
Surgery to correct the defect is needed. If the rectum connects with other organs, these organs will also need to be repaired. A temporary colostomy (connecting the end of the large intestine to the abdomen wall so that stool can be collected in a bag) is often needed.
Most defects can successfully be corrected with surgery. Most children with mild defects do very well. However, constipation can be a problem.
Children who have more complex surgeries still have control over their bowel movements most of the time. However, they often need to follow a bowel program. This includes eating high-fiber foods, taking stool softeners, and sometimes using enemas.
Some children may need more surgery.
Calling your health care provider
This problem is often found when the newborn infant is first examined. Call your health care provider if a child that was treated for imperforate anus has abdominal pain or fails to develop any bowel control by the age of 3.
There is no known prevention.
Warner BW. Pediatric surgery. In: Townsend CM, Beauchamp RD, Evers BM, Mattox KL, eds. Sabiston Textbook of Surgery. 18th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 71.
Stafford SJ, Klein MD. Surgical conditions of the anus and rectum. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics.19th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 336.
Reviewed by:Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, Bethanne Black, Stephanie Slon, and Nissi Wang.
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