Corneal ulcer due to Exserohilum longirostratum.

A 47-year-old man sustained a traumatic injury to the left eye, and a corneal ulcer subsequently developed. Histologic examination of the corneal tissue revealed septate hyphae with acute angle branching. The mycologic and bacterial cultures yielded a dematiaceous fungus with ellipsoidal pigmented macroconidia borne sympodially on geniculate conidiophores. The multicellular macroconidia had prominent, protruding, truncated hila. The shorter macroconidia averaged 5-7 septa, and the longer conidia 13-21 septa. Growth on V-8 agar, alternating between fluorescent light and the dark, produced macroconidia more than 200 microns in length. The isolate was identified as Exserohilum longirostratum. This is believed to be the first documented case of mycotic keratitis caused by the phaeohyphomycete E longirostratum.