[Histopathology of mycoses in ORL]

This article is a histopathological review of fungus and actinomycosis infections seen in otorhinolaryngology. Actinomycosis with its charactéristic grains but sometimes difficult to differentiate from saprophytic bacterial granules. Aspergilloma and aspergillosis are seen frequently. Aspergillus filaments may be differentiated from those of Mucorales and those of Entomophtorales, agents responsible for tropical phycomycoses, the latter being characterised by the fibrinoid cuff which surrounds them. Candidiasis and yeast mycoses in the tissues also represent a very important area. Alongside cryptococcosis and sporotrichosis, emphasis is placed upon the frequency of mucosal localisations of histoplasmosis due to H. capsulatum. Sources of error related to false mycoses can be avoided by the routine use of PAS and Gomori-Grocott stains and careful morphological study.