Pyloric stenosis is a condition of infants characterized by hypertrophy of the pyloric muscle. The pylorus does not relax normally, resulting in a gastric outlet obstruction. The etiology of pyloric stenosis is not known with certainty but it may be secondary to a local deficiency of nitric oxide. The differential diagnosis is quite extensive and includes many medical conditions which may result in feeding intolerance. Common conditions which may present with vomiting include poor feeding technique, formula intolerance, gastroesophageal reflux, and gastroduodenitis. Other surgical conditions causing nonbilious emesis in this age group are rare.
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