Morgagni's hernia: believing is seeing.

The original description by Morgagni of the anterior diaphragmatic defect that bears his name implies a paramedian defect and this may be true when acquired in adulthood. In contrast, the anterior diaphragmatic defect that is observed in children is central rather than paramedian, as is often assumed. Its central retrosternal location has been confirmed by various methods, but is most clearly evident on laparoscopy.