[Morgagni-Larrey hernia (author's transl)]

The authors describe minutely Morgagni-Larrey hernia, that is the least frequent of the spontaneous herniae of diaphragm, but it seems that it has a real superior incidence that in past time. They sop, particularly, to sketch the different stages of diagphragmatic embryogenesis that, in its complexity, induces to morphogenetic mistakes of variable relief. These mistakes have always their role in the pathodenic mechanism of considerate disease. In the end, they report a case which happened to their observation and that seems to resume the paradigmatic data of Morgagni-Larrey hernia, for its etiopathogenic, anatomo-pathologic and symptomatologic characteristics.