Hernia through the foramen of Winslow.

An incarcerated internal hernia through the foramen of Winslow is an extremely rare cause of intestinal obstruction and about 105 such cases have been reported. An additional patient, in whom a part of jejunum was incarcerated through the foramen into the lesser sac and who was successfully treated surgically, is reported. The etiology, diagnosis, treatment and prognosis of this rare condition are discussed.