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5/9/2012

Normally, food passes easily from the stomach into the first part of the small intestine through a valve called the pylorus. In pyloric stenosis, the muscles of the pylorus are thickened. This prevents the stomach from emptying into the small intestine. The cause of the thickening is unknown, although genetic factors may play a role. ... Pyloric stenosis occurs more often in boys than in girls, and is rare in children older than 6 months. The condition is usually diagnosed by the time a child is 6 months old. ... Surgery usually provides complete relief of symptoms. -- MedlinePlus

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