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Anal Atresia: Causes, Symptoms & Treatment

Anal atresia is a congenital malformation in which the anal opening is absent or sealed. Surgical treatment is essential.

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Things worth knowing about "Anal atresia"

Anal atresia is a congenital malformation in which the anal opening is absent or sealed. Surgical treatment is essential.

What is Anal Atresia?

Anal atresia, also known as an anorectal malformation, is a congenital condition in which the anal opening is absent, closed, or located in an abnormal position. It occurs during embryonic development and affects approximately 1 in 5,000 newborns. Without timely treatment, normal bowel function is impossible, making anal atresia a medical emergency requiring immediate attention.

Causes

The exact causes of anal atresia are not fully understood in most cases. The malformation is thought to result from a disruption in the development of the rectum and perineal region during the first weeks of pregnancy. Contributing factors may include:

Genetic changes or chromosomal abnormalities
Environmental factors during pregnancy (e.g., certain medications or infections)
Combined malformation syndromes such as VACTERL association (simultaneous malformations of multiple organ systems)

Types of Anal Atresia

Anal atresia presents in several forms, ranging in severity:

High malformation: The rectum ends well above the pelvic floor, often with abnormal connections (fistulas) to the bladder or genital organs.
Low malformation: The rectum ends close to the normal anal position, often with a small fistula to the skin or nearby structures.
Cloacal malformation: A complex form in which the rectum, urethra, and vagina share a common channel (occurring exclusively in females).

Symptoms

Anal atresia is typically identified immediately after birth. Common signs include:

Absent or visibly missing anal opening
Failure to pass the first stool (meconium) within 24 to 48 hours after birth
Abdominal distension (bloating)
Passage of stool through an abnormal opening, such as a fistula to the vagina or urethra

Diagnosis

Diagnosis is usually made immediately after birth through a physical examination. Further investigations are used to assess the extent of the malformation:

Ultrasound: To visualize the rectum and adjacent structures
X-ray (e.g., invertogram): To determine the level of the malformation
MRI (magnetic resonance imaging): For detailed assessment of the pelvic floor muscles and associated anomalies
Screening for associated malformations, particularly involving the heart, kidneys, and spine

Treatment

The only effective treatment for anal atresia is surgical intervention. The specific procedure depends on the type and severity of the malformation.

Surgical Approach

Colostomy: In severe or high-type cases, a temporary artificial bowel opening (stoma) is created first to allow bowel function.
Posterior sagittal anorectoplasty (PSARP): The primary reconstructive surgery to create a functioning anal opening. It is typically performed within the first months of life.
Stoma closure: Once reconstruction is successful, the temporary stoma is reversed.

Follow-up and Long-term Care

Many children require long-term follow-up care after surgery, including:

Regular bowel irrigation programs (bowel management) to prevent constipation or fecal incontinence
Physiotherapy to strengthen the pelvic floor muscles
Psychological support for the child and family

Prognosis

The long-term outlook depends heavily on the type of anal atresia and the presence of associated malformations. Many children with low-type malformations achieve good bowel control after surgery. High-type malformations carry a greater risk of long-term fecal incontinence. Regular medical follow-up and specialized care significantly improve quality of life.

References

Pena, A. & Hong, A. (2000): Advances in the management of anorectal malformations. The American Journal of Surgery, 180(5), 370-376.
Levitt, M.A. & Pena, A. (2007): Anorectal malformations. Orphanet Journal of Rare Diseases, 2:33. DOI: 10.1186/1750-1172-2-33.
Wood, R.J. & Levitt, M.A. (2018): Anorectal Malformations. Clinics in Colon and Rectal Surgery, 31(2), 61-70. DOI: 10.1055/s-0037-1609020.

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