Subcutaneous mycosis in a cat due to Staphylotrichum coccosporum

A 5.5-year-old, male, feline leucosis virus-positive cat developed a concurrent dermatophytosis due to Microsporum canis and a subcutaneous infection due to Staphylotrichum coccosporum. St. coccosporum caused mycetoma-like lesions. The fungal elements revealed features like those seen in phaeohyphomycosis. Until now St. coccosporum has been described to be non-pathogenic. The pathogenicity of St. coccosporum was corroborated by experimental infection.