A Morgagni diaphragmatic hernia found after removal of mediastinal tumor

Morgagni hernia is a disease in which the abdominal contents herniate into the thoracic cavity through a congenital parasternal defect of the diaphragm resulting from an increased intra-abdominal pressure. Obesity, pregnancy, and a history of trauma are considered predisposing factors of Morgagni hernia. However, there is slight evidence that trauma has been the factor. Moreover, Morgagni hernia related to an operation has been rarely reported. We report a case of a female patient, whose mediastinal tumor had been removed 6 months prior to her being diagnosed with postoperative Morgagni hernia. There was a satisfactory result after the repair by an upper abdominal incision.