Question: What are colonic atresia and stenosis?
Answer: Colonic atresia is a birth defect in which part of the colon is completely blocked or missing. Colonic stenosis, which may be a birth defect or may develop later in life, is a condition in which part of the colon is more narrow than normal.
Question: How common are colonic atresia and stenosis?
Answer: About 1 in every 10,000 to 66,000 babies is born with colonic atresia.2

Experts don’t know how common colonic stenosis is. At birth, colonic stenosis is rarer than colonic atresia.3 Most cases of colonic stenosis develop later in life and are caused by injury or inflammation.
Question: Who is more likely to get colonic atresia and stenosis?
Answer: Experts don’t know who is more likely to have colonic atresia and stenosis at birth.

People are more likely to develop colonic stenosis later in life if they have an injury or inflammation of the colon that may cause stenosis.

Premature babies might develop colonic stenosis after having necrotizing enterocolitis, a condition in which the wall of the intestine suffers serious damage.
Question: What other health problems do babies born with colonic atresia have?
Answer: Babies born with colonic atresia may have other birth defects, including

atresia in thesmall intestine
defects of the wall of theabdomen
Hirschsprung disease
malrotation
Question: What are the complications of colonic atresia and stenosis?
Answer: Colonic atresia causes intestinal obstruction, in which the colon is completely blocked. If colonic atresia is not diagnosed and treated shortly after a baby is born, intestinal obstruction can lead to serious complications such as

dehydration
a perforation, or hole, in the wall of the intestine
infection andsepsis, a serious illness that occurs when the body has an overwhelmingimmune systemresponse to an infection

Colonic stenosis can also cause intestinal obstruction and its complications.
Question: What are the signs and symptoms of colonic atresia and stenosis?
Answer: Colonic atresia and stenosis may cause signs and symptoms due to intestinal obstruction. Anyone with signs or symptoms of intestinal obstruction needs medical help right away.

Signs of intestinal obstruction due to colonic atresia include

bloatingor visible swelling of the abdomen
passing nostool
vomiting, often withbilein the vomit, which makes it green in color

These signs typically appear in babies soon after birth.

Colonic stenosis can also cause intestinal obstruction, and signs and symptoms may be similar to those of colonic atresia. Signs and symptoms may be milder or may come and go if the colon is not completely blocked.
Question: What causes colonic atresia and stenosis?
Answer: Experts aren’t sure what causes colonic atresia and stenosis to occur as birth defects. One theory is that before birth, something happens to reduce the flow of blood to part of the colon.

Injury or inflammation of the colon may cause colonic stenosis at any time during a person’s life. For example, necrotizing enterocolitis is a common cause of colonic stenosis in babies. Later in life, inflammatory bowel disease (IBD), such as Crohn’s disease, is a cause of colonic stenosis, also called a stricture.
Question: How do doctors diagnose colonic atresia and stenosis?
Answer: To diagnose colonic atresia and stenosis, doctors ask about symptoms and medical history and perform a physical exam and imaging tests.

Physical exam

During a physical exam, the doctor may

check for bloating of the abdomen
check for a lump or mass in the abdomen
press or tap on the abdomen to check for tenderness or pain
use a stethoscope to listen to sounds in the abdomen
check for signs ofcomplications, such as dehydration or infection

Imaging tests

Doctors may use the following tests to diagnose colonic atresia and stenosis

x-rays, which use a small amount of radiation to create pictures of the inside of the body
ultrasound, which uses sound waves to create an image of organs
lower GI series, which uses x-rays and a chalky liquid called barium to view thelarge intestine
Question: How do doctors treat colonic atresia and stenosis?
Answer: Doctors treat colonic atresia and stenosis with surgery to remove the blocked or narrowed part of the colon and attach the healthy ends of the colon to each other.

In some cases, doctors treat colonic atresia or stenosis with one operation. In other cases, doctors first perform a colostomy to attach the colon to a stoma, an opening in the abdomen that allows stool to exit the body. Later, doctors perform a second operation to attach the healthy ends of the colon to each other.