Phaeohyphomycotic cyst caused by Tetraploa aristata.

A case of phaeohyphomycotic cyst on the left knee of a 54-year-old man caused by Tetraploa aristata is described. Identification was based on the coloration and morphology of the fungus in tissue and the macro- and micro-morphologic characteristics of the mould isolated from the cyst fluid. T. aristata is a dematiaceous hyphomycete found on the leaves and stems of a variety of plants. Previously, it has been known as an etiologic agent of two human cases of keratomycosis. Here we describe the first known subcutaneous phaeohyphomycotic infection caused by T. aristata.