Imperforate anus (IA), also known as an anorectal malformation, is a congenital condition in which the opening to the anus is missing or blocked. It occurs in approximately 1 in every 4,000 to 5,000 live births.
IA is often associated with other congenital anomalies, including fistulas connecting the rectum to the urinary tract and malformations involving the esophagus, spine, heart, and urogenital system.
Symptoms of Imperforate Anus (IA)
Since the anus is absent or blocked, newborns with IA are unable to pass meconium after birth. If diagnosis is delayed, symptoms such as abdominal distension may develop.
- No passage of first stool within 24 to 48 hours after birth
- Stool passes out of the vagina, base of penis, scrotum or urethra
- Swollen belly
What Causes Imperforate Anus (IA)?
The majority of IA cases occur sporadically, and the exact cause is unknown.