Duplication cyst of pyloric canal: a rare cause of pediatric gastric outlet obstruction: rare case report.

Duplication of the alimentary tract may occur in any site, from the mouth to the anus, and in recent years such anomalies have received wide notice. Pyloric duplication cyst is an extremely rare congenital anomaly of the alimentary tract, whose clinical presentation often mimics those of hypertrophic pyloric stenosis. Gastrointestinal duplications are observed in 1 of every 4500 autopsies, predominantly in white males. It represents 2.2 % of all gastric duplications, with only 18 have been reported up to 2011 (Table 1). In most cases preoperative diagnosis is not made. We report a case of a pyloric duplication cyst in a 3-year-old girl with progressive increased vomiting. The patient had an ultrasonography, upper gastrointestinal series, and computer tomography of the abdomen. The diagnosis was confirmed by surgery and histopathology examination. The patient was asymptomatic at 12-month follow-up. The clinical and radiological analysis can reveal configurational changes consistent with a large extrinsic mass rather than muscular hypertrophy and can lead to accurate preoperative diagnosis.