You are in Medical Library . In infants, this condition is caused by a thickening of the musculature of the pylorus, which stops the stomach from emptying into the duedenum and small intestine. The cause of the thickening is unknown, although genetic factors may play a role. It occurs more commonly in males than in females. Approximately 1 out of 4,000 infants is affected.
Symptoms appear several weeks after birth.
Signs And Tests Physical examination may show signs of dehydration . The infant may have a distended abdomen . A chemistry panel often reveals electrolyte imbalances . A barium X-ray reveals a distended stomach and narrowed pylorus. An ultrasound of abdomen may also be performed.