Ultrastructural observations on vasomotor rhinitis.

The ultrastructure of the respiratory nasal mucosa of patients suffering from vasomotor rhinitis was studied and compared with the reported ultrastructural findings in cases of chronic perennial allergic rhinitis. The principal ultrastructural differences were the absence of interendothelial gap junctions, the scarcity of eosinophils and plasma cells, and the absence of immunologically stimulated or degranulated mast cells in vasomotor rhinitis. These differences were discussed in the light of the known pathophysiologic facts.