Which condition presents as a "coffee bean" appearance on an X-ray?

• A. Intussusception
• B. Midgut volvulus
• C. Hirschsprung disease
• D. Meconium ileus

Answer: (B)

The "coffee bean" appearance on an X-ray is most commonly associated with midgut volvulus, which is a condition characterized by a twisting of the intestine. This appearance is due to the distension of loops of bowel trapped in the volvulus, creating a characteristic shape reminiscent of a coffee bean on imaging. The twisted segments of the bowel can lead to obstruction and compromise blood supply, resulting in a surgical emergency.

Other conditions presented in the options demonstrate different radiological findings. Intussusception typically shows a "target sign" or "doughnut sign" on ultrasound or X-ray, where one segment of the bowel has telescoped into another. Hirschsprung disease is associated with a lack of ganglion cells in the distal colon, leading to a transition zone and a proximal dilated colon, generally not exhibiting a coffee bean appearance. Meconium ileus is noted for a "plug" of thick meconium affecting the intestines, leading to different radiographic signs, such as multiple dilated bowel loops with a paucity of air in the distal bowel.

Thus, the distinctive "coffee bean" appearance is a defining characteristic of midgut volvulus and signals the need for prompt diagnosis and intervention.