Figure 1. Radiographs of patients with multiple endocrine neoplasia type 2A and Hirschsprung’s disease who had abdominal pain, distention, and vomiting. (A) Abdominal radiograph of 1-month-old patient showing dilated loops of bowel with multiple air–fluid levels and absence of air in the rectum. (B) The same patient’s barium enema showing a dilated sigmoid colon resulting from aganglionosis. Arrows designate an area of narrowing at the rectum. (C) Anterior-posterior view of the same patient. (D) Lateral view of contrast enema in a 7-year-old boy with multiple endocrine neoplasia type 2A and Hirschsprung’s disease showing a dilated descending colon proximal to a contracted distal segment (black arrows).