Congenital Megacolon – Causes, Symptoms, Treatment

Hirschsprung disease is a birth defect in which nerve cells are missing at the end of a child’s bowel. Normally, the bowel contains many nerve cells all along its length that control how the bowel works. When the bowel is missing nerve cells, it does not work well. This damage causes blockages in the bowel because the stool does not move through the bowel normally.

Most often, the areas missing the nerve cells are the rectum and the sigmoid colon. However, some children are missing the nerve cells for the entire colon or part of the small intestine.

• In short-segment Hirschsprung disease, nerve cells are missing from the last part of the large intestine.
• In long-segment Hirschsprung disease, nerve cells are missing from most or all of the large intestine and sometimes the last part of the small intestine.
• Rarely, nerve cells are missing in the entire large and small intestine.

In a child with Hirschsprung disease, the stool moves through the bowel until it reaches the part lacking nerve cells. At that point, the stool moves slowly or stops.

What are the bowel, large intestine, colon, rectum, and anus?

The bowel consists of the small and large intestines. The large intestine, which includes the colon and rectum, is the last part of the gastrointestinal (GI) tract. The large intestine’s main job is to absorb water and hold stool. The rectum connects the colon to the anus. Stool passes out of the body through the anus. At birth, the large intestine is about 2 feet long. An adult’s large intestine is about 5 feet long.

What causes Hirschsprung disease?

During the early development of the baby in the mother’s womb, nerve cells stop growing toward the end of a child’s bowel causing Hirschsprung disease. Most of these cells start at the beginning of the bowel and grow toward the end. Hirschsprung disease occurs when these cells do not reach the end of a child’s bowel. Scientists know that genetic defects can increase the chance of a child developing Hirschsprung disease. However, no testing exists that can diagnose a child while the mother is pregnant. Researchers are studying if the mother’s health history or lifestyle during pregnancy increases the chance of her baby developing Hirschsprung disease.

Who gets Hirschsprung disease?

Hirschsprung disease occurs in approximately one in 5,000 newborns. Children with Down syndrome and other medical problems, such as congenital? heart defects, are at much greater risk. For example, about one in 100 children with Down syndrome also has Hirschsprung disease.

Hirschsprung disease is congenital?, or present at birth; however, symptoms may or may not be obvious at birth. If you have a child with Hirschsprung disease, your chances of having more children with Hirschsprung disease are greater than people who don’t have a child with Hirschsprung disease. Also, if a parent has Hirschsprung disease, the chance of their child having Hirschsprung disease is higher. Talk with your doctor to learn more.

What are the signs and symptoms of Hirschsprung disease?

The main signs and symptoms of Hirschsprung disease are constipation? or intestinal obstruction, usually appearing shortly after birth. Many healthy infants and children have difficulty passing stool or infrequent bowel movements. However, unlike healthy children and infants, kids with Hirschsprung disease typically do not respond to constipation medicines given by mouth. Most often, an infant or a child with Hirschsprung disease will have other symptoms, including

• growth failure
• swelling? of the abdomen, or belly
• unexplained fever?
• vomiting?

The symptoms can vary; however, how they vary does not depend on how much of the intestine is missing nerve cells. No matter where in the intestine the nerve cells are missing, once the stool reaches this area, the blockage forms and the child develops symptoms.

Symptoms in Newborns

An early symptom in some newborns is failure to have a first bowel movement within 48 hours after birth. Other symptoms may include

• green or brown vomit
• explosive stools after a doctor insert a finger into the newborn’s rectum
• swelling? of the abdomen
• diarrhea?, often with blood
• Symptoms of Hirschsprung disease in newborns, toddlers, and older children may include swelling? of the abdomen.

Symptoms in Toddlers and Older Children

Symptoms of Hirschsprung disease in toddlers and older children may include

• not being able to pass stools without enemas or suppositories. An enema involves flushing liquid into the child’s anus using a special wash bottle. A suppository is a pill placed into the child’s rectum.
• swelling? of the abdomen.
• diarrhea?, often with blood.
• slow growth.

How does a doctor know if my child has Hirschsprung disease?

A doctor will know if your child has Hirschsprung disease based on

• a physical exam
• a medical and family history
• symptoms
• test results

If your doctor suspects Hirschsprung disease, he or she may refer your child to a pediatric gastroenterologist—a doctor who specializes in digestive diseases in children—for additional evaluation.

Physical Exam

During a physical exam, a doctor usually

• reviews your child’s height and weight
• examines your child’s abdomen for swelling? and examines his or her body for signs of poor nutrition
• uses a stethoscope to listen to sounds within the abdomen
• taps on specific areas of your child’s body
• performs a rectal exam—explosive stool after a rectal exam may be a sign of Hirschsprung disease

Medical and Family History

A doctor will ask you to provide your child’s medical and family history to help diagnose Hirschsprung disease. The doctor will ask questions about your child’s bowel movements. The doctor will also ask about vomiting?, swelling? of the abdomen, and unexplained fever?. The doctor is less likely to diagnose Hirschsprung disease if problems with bowel movements began after 1 year of age.

Medical Tests

A doctor who suspects Hirschsprung disease will do one or more of the following tests:

• Rectal biopsy? – A rectal biopsy? is a procedure that involves taking a small piece of tissue from the rectum for examination with a microscope. The doctor can perform two types of procedures:
  • a rectal “suction” biopsy?. During this biopsy, a pediatric gastroenterologist or a pediatric surgeon will insert a small instrument into the child’s anus and remove a small piece of tissue from the lining of his or her rectum. The biopsy is not painful and babies may even fall asleep during the procedure. In most cases, doctors do not use pain? medicine or anesthesia. However, for older children doctors sometimes will use medicine to relieve anxiety or reduce the memory of the test.
  • a “full thickness” rectal biopsy?. A pediatric surgeon performs this procedure, in which he or she will remove a thicker piece of tissue. The child will receive anesthesia.

  A doctor will examine the tissue under a microscope. The rectal biopsy? is the best test to diagnose or rule out Hirschsprung disease.

• Abdominal x-ray? – An x-ray? is a picture created by using radiation and recorded on film or on a computer. The amount of radiation is small. An x-ray technician performs the x-ray at a hospital or an outpatient center, and a radiologist—a doctor who specializes in medical imaging—interprets the images. The child does not need anesthesia. The child will lie on a table or stand during the x-ray. The technician may ask the child to change positions for additional pictures. An x-ray of the abdomen may show intestinal obstruction.
• Anorectal Manometry – Anorectal manometry is a test that uses pressure sensors and balloons to measure how well the child’s rectum is working. A doctor performs anorectal manometry in a hospital. During the procedure, the doctor inflates a small balloon inside the child’s rectum. Normally, the child’s rectal muscles will relax. If his or her muscles don’t relax, the doctor may suspect Hirschsprung disease.
• Lower GI series – A lower GI series is an x-ray? exam that doctors use to look at the large intestine. An x-ray technician and a radiologist perform the test at a hospital or an outpatient center, and a radiologist interprets the images. A child does not need anesthesia and does not need a bowel prep for the test.
• For the test, the child will lie on a table while the radiologist inserts a flexible tube into the child’s anus. The radiologist fills the child’s large intestine with barium or another contrast material. A technician performs this test on newborns, toddlers, and older children. A lower GI series can show changes in the bowel and help doctors diagnose obstructions.

In most cases, doctors diagnose Hirschsprung disease in infancy; however, sometimes doctors diagnose Hirschsprung disease in older children.

How is Hirschsprung disease treated?

Hirschsprung disease is a life-threatening illness, and treatment requires surgery. Children who have surgery for Hirschsprung disease most often feel better after surgery. If growth was slow because of Hirschsprung disease, growth typically improves after surgery.

For treatment, a pediatric surgeon will perform a pull-through procedure or an ostomy surgery. During either procedure, the surgeon may remove all or part of the colon, called a colectomy.

Pull-through Procedure

During a pull-through procedure, a surgeon removes the part of the large intestine that is missing nerve cells and connects the healthy part to the anus. A surgeon most often does a pull-through procedure soon after diagnosis?.

Ostomy Surgery

Ostomy surgery is a surgical procedure that reroutes the normal movement of the stool out of the body when a part of the bowel is removed. Creating an ostomy means bringing part of the intestine through the abdominal wall so that stool can leave the body without passing through the anus. The opening in the abdomen through which stool leaves the body is called a stoma.

A removable external collection pouch called an ostomy pouch or ostomy appliance is attached to the stoma and worn outside the body to collect the stool. The child or caregiver will need to empty the pouch several times each day.

Although most children with Hirschsprung disease do not need ostomy surgery, a child sick from Hirschsprung disease may need ostomy surgery to get better before undergoing the pull-through procedure. This gives the inflamed areas of the intestine time to heal. In most cases, an ostomy is temporary and the child will have a second surgery to close the ostomy and reattach the intestine. However, sometimes children with Hirschsprung disease have a permanent ostomy, especially if a long segment of the bowel is missing nerve cells or the child has repeated episodes of bowel infection?, or irritation, often causing pain?, swelling?, heat, or redness. সহজ বাংলা: শরীরের প্রদাহ; ব্যথা, ফোলা বা লালভাব হতে পারে।" data-rx-term="inflammation" data-rx-definition="Inflammation is the body’s response to injury, infection, or irritation, often causing pain, swelling, heat, or redness. সহজ বাংলা: শরীরের প্রদাহ; ব্যথা, ফোলা বা লালভাব হতে পারে।">inflammation?, which health care providers call enterocolitis.

Ostomy surgeries include the following:

• Ileostomy surgery is when the surgeon connects the small intestine to the stoma.
• Colostomy surgery is when the surgeon connects part of the large intestine to the stoma.

More information is provided in the NIDDK health topic, Ostomy Surgery of the Bowel.

What can I expect as my child recovers from surgery?

After surgery, your child will need time to adjust to the new structure of his or her large intestine.

After the Pull-through Procedure

Most children feel better after the pull-through procedure. However, some children can have complications or problems after surgery. Problems can include

• narrowing of the anus
• constipation?
• diarrhea?
• leaking stool from the anus
• delayed toilet training
• enterocolitis

Typically, these problems improve over time with guidance from your child’s doctors. Most children eventually have normal bowel movements.

After Ostomy Surgery

Infants will feel better after ostomy surgery because they will be able to pass gas and stool easily.

Older children will feel better as well, although they must adjust to living with an ostomy. They will need to learn how to take care of the stoma and how to change the ostomy pouch. With a few lifestyle changes, children with ostomies can lead normal lives. However, they may worry about being different from their friends. A special nurse, called an ostomy nurse, can answer questions and show your child how to care for an ostomy. More information is provided in the NIDDK health topic, Ostomy Surgery of the Bowel.

Enterocolitis

Adults and children with Hirschsprung disease can suffer from enterocolitis before or after surgery. Symptoms of enterocolitis may include

• a swollen abdomen
• bleeding from the rectum
• diarrhea
• fever
• lack of energy
• vomiting

A child with enterocolitis needs to go to the hospital because enterocolitis can be life-threatening. Doctors can treat some children with enterocolitis with a special antibiotic by mouth, often in combination with rectal irrigation at home and in the doctor’s office. During rectal irrigation, a doctor inserts a small amount of mild saltwater into the child’s rectum and allows it to come back out.

Doctors will admit children with more severe symptoms of enterocolitis to the hospital for monitoring, rectal irrigation, and intravenous (IV) antibiotics, and IV fluid. Doctors give IV antibiotics and fluids through a tube inserted into a vein in the child’s arm. In severe or repeated cases of enterocolitis, a child may need a temporary ostomy to let the intestine heal or a revision of the pull-through surgery.

Eating, Diet, and Nutrition

If a surgeon removes the child’s colon or bypasses it because of an ostomy, the child will need to drink more liquids to make up for water loss and prevent dehydration. They also need twice as much salt as a healthy child. A doctor can measure the sodium in a child’s urine and adjust his or her diet to ensure adequate salt replacement.

Some infants may need tube feedings for a while. A feeding tube is a passageway for the infant to receive infant formula or liquid food directly into his or her stomach or small intestine. The doctor will pass the feeding tube through the nose. In some cases, the doctor will recommend a more permanent feeding tube that he or she puts in place surgically in the child’s abdomen.

Points to Remember

• Hirschsprung disease is a birth defect in which nerve cells are missing at the end of a child’s bowel.
• In a child with Hirschsprung disease, the stool moves through the bowel until it reaches the part lacking nerve cells. At that point, the stool moves slowly or stops.
• During the early development of the baby in the mother’s womb, nerve cells stop growing toward the end of a child’s bowel causing Hirschsprung disease.
• Hirschsprung disease occurs in approximately one in 5,000 newborns. Children with Down syndrome and other medical problems, such as congenital heart defects, are at much greater risk.
• The main signs and symptoms of Hirschsprung disease are constipation or intestinal obstruction, usually appearing shortly after birth. Most often, an infant or a child with Hirschsprung disease will have other symptoms, including growth failure, swelling of the abdomen, unexplained fever, or vomiting.
• A doctor will know if your child has Hirschsprung disease based on a physical exam, a medical and family history, symptoms, and test results.
• Hirschsprung disease is a life-threatening illness, and treatment requires surgery. Children who have surgery for Hirschsprung disease most often feel better after surgery. If growth was slow because of Hirschsprung disease, growth typically improves after surgery.

Clinical Trials

The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) and other components of the National Institutes of Health (NIH) conduct and support research into many diseases and conditions.

What are clinical trials, and are they right for you?

Clinical trials are part of clinical research and at the heart of all medical advances. Clinical trials look at new ways to prevent, detect, or treat disease. Researchers also use clinical trials to look at other aspects of care, such as improving the quality of life for people with chronic illnesses. Find out if clinical trials are right for you .

What clinical trials are open?

Clinical trials that are currently open and are recruiting can be viewed at www.ClinicalTrials.gov

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