Health Encyclopedia
Imperforate anus
Definition
Imperforate anus is congenital (present from birth) defect in which the opening to the anus is missing or blocked. The anus is the opening to the rectum through which stools leave the body.
Alternative Names
Anorectal malformation; Anal atresiaCauses
Imperforate anus may occur in several forms. The rectum may end in a blind pouch that does not connect with the colon. Or, it may have openings to the urethra, bladder, base of penis or scrotum in boys, or vagina in girls. A condition of stenosis (narrowing) of the anus or absence of the anus may be present.
The problem is caused by abnormal development of the fetus, and many forms of imperforate anus are associated with other birth defects. It is a relatively common condition that occurs in about 1 out of 5,000 infants.
Symptoms
- Anal opening very near the vaginal opening in girls
- Missing or misplaced opening to the anus
- No passage of first stool within 24 - 48 hours after birth
- Stool passes out of the vagina, base of penis, scrotum, or urethra
- Swollen belly area
Exams and Tests
A doctor can diagnose this condition during a physical exam. Imaging tests may be recommended.
Treatment
The infant should be checked for other problems, especially those affecting the genitals, urinary tract, and spine.
Surgical reconstruction of the anus is needed. If the rectum connects with other organs, repair of these organs will also be necessary. A temporary colostomy is often required.
Outlook (Prognosis)
With treatment, the outcome is usually good. However, it depends on the exact problem. Some infants may never develop adequate bowel control.
Possible Complications
- Bowel incontinence
- Constipation
- Intestinal blockage
When to Contact a Medical Professional
This disorder is usually discovered 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.
Prevention
As with most birth defects, there is no known prevention.
Reviewed By: Jenifer K. Lehrer, MD, Department of Gastroenterology, Frankford-Torresdale Hospital, Jefferson Health System, Philadelphia, PA. Review provided by VeriMed Healthcare Network.
