Understanding Intestinal Obstruction & Meconium Peritonitis
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What is prenatal intestinal obstruction?
Intestinal Obstruction is a blockage in the baby’s intestine before birth. This can prevent normal movement of intestinal contents and may lead to dilation of the bowel that can be seen on prenatal ultrasound.
Common causes include:
- Intestinal atresia: where a portion of the intestine is blocked or didn’t form properly
- Meconium ileus: thick, sticky stool blocks the intestine, often associated with cystic fibrosis
- Meconium plug syndrome: hard, dry stool is stuck in the colon not allowing intestinal contents to move
- Hirschsprung disease: caused by missing nerve cells in part of the bowel, most common in the rectum, which doesn't allow it to empty properly
- Anorectal malformation: formerly known as imperforate anus, this is a spectrum of defects, where the rectum doesn't properly connect with with anus
(Pic: types of prenatal obstruction)
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What is meconium peritonitis?
Meconium peritonitis is a condition that occurs when there is a small hole (perforation) in the baby’s intestine before birth. This allows meconium (the baby’s first stool) to leak into the abdominal cavity, causing inflammation.
Over time, the body may try to “wall off” the leak, which can lead to:
- Calcifications (bright spots seen on ultrasound)
- Fluid collections or cysts
- Dilated (enlarged) bowel loops from suspected obstruction
Meconium peritonitis has a range of presentations from simple abdominal calcifications to a large inflammatory cyst to intestinal obstruction..
(Pic: ultrasound of a fetus with meconium peritonitis, arrow demonstrates a cyst with surrounding calcifications)
Fetal Center: the first step in care
Multidisciplinary Evaluation: meet with MFM specialist, pediatric surgeon, neonatologist, and other experts who will care for your baby
Comprehensive Imaging: detailed ultrasounds and other tests when indicated to assess your baby's condition and help plan treatment
Coordinated Delivery Planning: our team works to ensure your baby receives immediate specialized care at birth
How are these conditions diagnosed before birth?
These conditions are usually suspected on routine prenatal ultrasound.
Findings may include:
- Dilated (enlarged) bowel loops
- Bright (echogenic) bowel
- Abdominal calcifications
- Fluid in the abdomen (ascites)
- A cyst-like structure in the abdomen
In some cases, additional imaging such as fetal MRI may be recommended to better define fetal anatomy.
If meconium ileus is suspected, genetic testing to evaluate for cystic fibrosis may be discussed.
(Pic: ultrasound of a fetus with intestinal atresia, with the arrow showing the dilated bowel)
Neonatal Intensive Care
Babies with suspected intestinal obstruction or meconium peritonitis should be delivered at our center where a neonatal intensive care unit (NICU) is available that specializes in the care of these infants and where a pediatric surgeon can immediately evaluate your child. The neonatologist is a specially trained pediatrician that will manage your baby’s medications, feeding, and daily needs while in the NICU.
Once the child is born, a neonatologist will evaluate the baby and make sure the heart and lungs are working appropriately. A tube placed through the mouth (oral gastric or OG) into the stomach to suck out air and fluid to prevent your baby from choking contents into the lungs.
Your baby will receive fluids and antibiotics through a special IV called a PICC line, typically placed in one of the limbs. Because the child will not be initially allowed to eat, they will also receive nutrition through the PICC line called TPN, or total parenteral nutrition, containing protein, fat, sugar, vitamins, and minerals and will meet all your baby’s nutritional needs
Feedings usually begin 5 - 7 days after surgical repair, typically at a low level, gradually increasing to goal.
A child with intestinal atresia is expected to be in the hospital for 6 - 8 weeks, although this may be longer if other problems are also present
What happens after delivery?
After birth, your baby will be evaluated by a neonatal and surgical team.
This may include imaging, such as:
- Abdominal X-ray: an x-ray of the abdomen which will show if and how much of the bowel is dilated
- Abdominal ultrasound: sometimes used to further evaluate the abdomen for a cyst and it's relation to the intestines
- Contrast enema: used to evaluate the colon to help with the diagnosis, and sometimes used in the treatment of meconium ileum and meconium plug syndrome
Some babies:
- Can be managed without surgery with observation or with medical therapies
- Need surgery to remove or repair the blocked or damaged portion of intestine
(Pic: Contrast enema of a newborn demonstrating a small colon and large dilated small bowel consistent with intestinal atresia)
What is the treatment for Intestinal atresia?
The definitive treatment for intestinal atresia is surgical repair.
The most common operation is an abdominal exploration, to identify the cause. In most cases the blocked upper portion of intestine is connected with the lower portion (intestinal anastomosis) to restore continuity of the bowel.
- Typically performed within the first few days of life
- Usually done via an open incision
- In some cases, due to the underlying cause, an ostomy, where the end of the bowel is brought up to the skin allowing for intestinal contents to drain into a bag, may be needed. This is typically temporary, and will be reversed, where the two ends of bowel are brought back together in continuity 6 - 8 weeks later.
(Pic: surgical team performing surgery)
Prognosis and Long-term Outcomes
Overall, the prognosis for distal intestinal obstruction diagnosed before birth is very good.
- Survival rates exceed 90–95% in modern neonatal centers
- Outcomes are especially favorable when the condition is isolated and the bowel is otherwise healthy
What influences outcome:
- The underlying cause (e.g., intestinal atresia vs. meconium ileus vs. Hirschsprung disease)
- The condition and amount of the bowel at birth
- Presence of associated conditions, particularly cystic fibrosis
Long-term outlook:
- Most children have normal growth, feeding, and development
- A small number may have ongoing bowel or feeding challenges, depending on the diagnosis (especially those with a small amount of bowel remaining)
The prognosis for meconium peritonitis is also generally excellent, especially with prenatal diagnosis and coordinated care.
- Survival rates are greater than 90%
- Outcomes have improved significantly with early detection and planned delivery at specialized centers
What influences outcome:
- Severity of the intestinal perforation and inflammation
- Whether the condition is contained (e.g., calcifications only) or more complex (e.g., cyst or ongoing leakage)
- Underlying causes such as meconium ileus from cystic fibrosis
Long-term outlook:
- Most children recover and have normal bowel function and development
- More complex cases may require longer recovery or additional support early in life
Long-Term Pediatric Feeding Support
Complex patients may require long-term care to assist them in obtaining the proper amount of nutrition for continued growth and development. Primary Children's Hospital has clinics to assist parents.
Our team provides specialized care by combining the expertise of pediatric gastroenterologists, psychologists, nurse practitioners, speech-language pathologists, and dieticians. By coming together with a group of care professionals, we will address feeding and swallowing challenges for your child, at any age.
