Hirschsprung disease is a congenital gastrointestinal disorder characterized by megacolon due to a lack of .
USMLE® Step 1 style questions USMLE
USMLE® Step 2 style questions USMLE
A neonate is born to a 40-year-old woman, gravida 1, para 0. The neonate has upslanting palpebral fissures and a flat facial profile. The child feeds well, but by the second day still has not passed any meconium. An abdominal X-ray is done, and the results are shown below. Which of the following is most likely to be found on rectal biopsy?