Allergic fungal sinusitis is a common disease that results from a hype
rsensitivity reaction mounted by the host against fungi living in the
paranasal sinuses. We have recently treated a patient with allergic fu
ngal sinusitis due to a Nodulisporium species. This is the first descr
iption of a Nodulisporium species involved in human disease. The genus
Nodulisporium contains both dematiaceous and nondematiaceous members.
These fungi occur worldwide in nature, often as accompanying conidial
anamorphs of certain wood decay ascomycetes. Clinical mycology labora
tories may encounter this new agent of phaeohyphomycosis.