Congenital Transmesenteric Hernia With Closed-Loop Small Bowel Obstruction and Intestinal Gangrene in an Adult.

Internal hernias (IHs) are defined as the protrusion of the intestine through an aperture in the peritoneal ligament, mesentery, or the omentum, without traversing the fascial planes and leading to encapsulation of the protruded intestine within another compartment of an otherwise intact abdominal cavity. Internal hernias can be acquired or congenital. Congenital internal hernias resulting in small bowel obstruction are extremely rare, even more so in adults, occurring usually due to embryological or developmental defects, often undiagnosed, and requiring a high index of clinical suspicion.