[Histological and ultrastructural study of intestinal ganglioneuromatosis. The multiple endocrine neoplasms type IIb syndrome].

The syndrome known as the Multiple Endocrine Neoplasia type III or type IIb presents a particular histological intestinal lesion: hyperplasia of the myenteric plexus. The electron microscopic study of the plexus of Auerbach in our observation suggests a disequilibrium of the different types of individual axonal sheaths compared to the descriptions of a normal plexus. The possible role of this anomaly in the genesis of intestinal manifestations in this syndrome is here discussed.