Intestinal Malrotation
A birth defect in how the intestines are positioned
Quick Facts
- Type: Congenital (birth) intestinal condition
- Forms during: Fetal development
- Main danger: Volvulus (twisting of the bowel)
- Treatment: Surgery, often urgent if twisting occurs
Overview
Intestinal malrotation is a condition present from birth in which the intestines do not rotate and settle into their normal position while a baby is developing in the womb. Normally, the growing intestine coils and anchors itself securely inside the abdomen. In malrotation, this process is incomplete, leaving the intestine fixed in the wrong place and held by an abnormally narrow attachment.
The main concern with malrotation is that it makes a serious complication called volvulus more likely, in which a portion of the intestine twists around itself. A twist can cut off the blood supply to the bowel, which is a life-threatening emergency. Many cases are discovered in the first year of life, often during a volvulus, but some are found later or remain symptom-free. Surgery is the treatment.
For parents, the most important thing to know is the single warning sign that demands immediate action: green or yellow vomiting in a baby. While malrotation itself is silent until something goes wrong, a volvulus can develop suddenly and become an emergency within hours, so recognizing this sign and acting on it quickly can be lifesaving for the child.
Symptoms
Symptoms vary widely. Some children have none, while others develop sudden, severe signs of a twisting bowel.
- Green or yellow (bilious) vomiting in a baby, an important warning sign
- Sudden, severe abdominal pain or a swollen, tender abdomen
- Drawing up the legs and crying in infants
- Poor feeding and failure to gain weight
- Bloody stools
- In older children, recurring abdominal pain, vomiting, or constipation
Bile-stained (green) vomiting in an infant is a medical emergency because it can signal a volvulus. Seek emergency care immediately.
Causes
Malrotation happens because of an interruption in normal development before birth.
- Incomplete rotation in the womb: During fetal growth, the intestine normally rotates and fixes into place. If this rotation is incomplete or abnormal, the intestine ends up in the wrong position.
- Narrow attachment: The intestine is left anchored by a narrow base instead of a broad one, making it prone to twisting.
The cause of the developmental interruption is usually unknown. Malrotation can occur on its own or alongside other birth defects of the abdominal wall or organs.
Risk Factors
- Being born with certain other abdominal wall or organ defects
- Conditions in which abdominal organs are positioned abnormally
- Most cases occur without a clear risk factor and are present from birth
Diagnosis
Because volvulus is an emergency, suspected malrotation is evaluated quickly with imaging.
- Upper GI contrast study: X-rays taken after the child swallows a contrast liquid show where the intestine sits and can reveal malrotation or a twist.
- Ultrasound: Can show abnormal positioning of the intestinal blood vessels.
- Abdominal X-ray: May show signs of obstruction.
- CT scan: Sometimes used, especially in older children and adults.
Treatment
Treatment is surgical, and timing depends on whether a volvulus is present.
- Emergency surgery for volvulus: If the bowel has twisted, urgent surgery is needed to untwist it, restore blood flow, and remove any damaged intestine.
- The Ladd procedure: The standard operation that repositions the intestine, widens the narrow attachment to reduce the risk of future twisting, and often removes the appendix.
- Supportive care: Fluids, correction of dehydration, and stabilization before and after surgery.
When malrotation is found without a twist, surgery is usually still recommended to prevent a future volvulus.
Prevention
- Intestinal malrotation cannot be prevented, as it develops before birth
- The best protection is recognizing the warning signs early and seeking immediate care
- Parents should know that green vomiting in a baby is an emergency
- Following up after surgery helps catch any later complications
When to See a Doctor
Green or yellow (bilious) vomiting in an infant is a medical emergency. Call emergency services or go to the emergency department immediately, as it can signal a volvulus that cuts off the bowel's blood supply. Also seek urgent care for sudden severe abdominal pain, a swollen or tender belly, bloody stools, or a baby who is very irritable, lethargic, or refusing to feed. Rapid treatment of a volvulus is critical to saving the intestine.
Frequently Asked Questions
What is intestinal malrotation?
It is a birth defect in which the intestines do not rotate into their normal position during fetal development, leaving them fixed abnormally and held by a narrow attachment. This makes a dangerous twisting of the bowel, called volvulus, more likely.
Why is malrotation dangerous?
The main danger is volvulus, in which the intestine twists around its narrow base. A twist can cut off the blood supply to the bowel, which is life-threatening and requires emergency surgery to prevent permanent damage.
What is the warning sign in babies?
Green or yellow (bilious) vomiting in an infant is an important warning sign and a medical emergency. It can mean the bowel has twisted, so emergency care should be sought right away.
How is intestinal malrotation treated?
Treatment is surgery. If the bowel has twisted, urgent surgery untwists it and removes any damaged tissue. The standard operation, called the Ladd procedure, repositions the intestine and widens the narrow attachment to reduce the risk of future twisting.
Can malrotation be found in older children or adults?
Yes. While many cases are discovered in the first year of life, some people have few or no symptoms and are diagnosed later, sometimes during episodes of recurring abdominal pain or vomiting, or incidentally on imaging.
References
- MedlinePlus, U.S. National Library of Medicine. Volvulus.
- American Pediatric Surgical Association. Intestinal malrotation.
- Boston Children's Hospital. Intestinal Malrotation.
- Nationwide Children's Hospital. Malrotation and Volvulus.