Chronic hypertrophic polypoid rhinosinusitis.

Chronic hypertrophic polypoid rhinosinusitis is a condition in which the mucous membrane lining the nose and paranasal sinuses becomes markedly hypertrophied, and nasal polyps become evident. Superimposed infection is common. Bony erosion, sometimes marked, may also result. Because of the alterations in bone, the condition may be mistaken for other more serious lesions.