Morgagni-Larrey hernia is a rare diaphragmatic form whose time of onset is almost impossible to determine. Its symptoms, if any, are not easy to interpret. A standing X-ray of the chest is the only way in which its presence may be suspected and diagnosis must be confirmed by the use of contrast media. Abdominal or thoracic surgery is mandatory, even in symptom-free cases. The choice of route will be determined by the facts of the case and the patient's age. The clinical picture observed in two personal cases and their treatment are described.