Emergency Physicians Monthly has teamed up with the board prep pros at Rosh Review to bring you a mini board review, so that you can test yourself on a regular basis and track your progress. The following is the test – and answers – from the March edition of Emergency Physicians Monthly. Questions about the test? Talk back on Twitter @epmonthly.
QUESTION: A mother brings her full-term 3-day-old male newborn to the ED after she noticed an episode of dark tarry stool at home. Mom delivered the newborn vaginally without any complications. Mom is a vegetarian and is breastfeeding. On exam, the patient is afebrile. His abdomen is soft with no palpable masses. Rectal exam reveals dark tarry stool that is guaiac positive. Which of the following is the most likely cause of this patient’s presentation?
A. Meckel’s diverticulum
B. Milk protein allergy
C. Necrotizing enterocolitis
D. Swallowed maternal blood