The pediatric nurse examines a 5-week-old infant who has been observed having projectile,nonbilious vomiting.Upon palpation,the nurse feels an olive-shaped mass in the midepigastrium.On the basis of these data,which condition does the nurse suspect?

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Projectile, nonbilious vomiting and an olive-shaped mass in the midepigastrium are classic signs of hypertrophic pyloric stenosis. Rectal atresia would present with constipation, failure to pass meconium, and a distended abdomen. Intussusception would present with abdominal pain, vomiting, and bloody stools. Malrotation of the intestine may present with vomiting and a distended abdomen, but would not have the characteristic olive-shaped mass.

The Pediatric Nurse Examines a 5-Week-Old Infant Who Has Been