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Pathology
A 3-week-old boy is brought to the physician by his parents, who repo that he vomits forcefully immediately after nursing. Physical examination reveals an "olive-like" palpable mass and visible peristaltic movements within the infant's abdomen. What is the most likely cause of projectile vomiting in this infant?
Appendicitis
Congenital pyloric stenosis
Hirschsprung disease
Meconium ileus
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