Pseudomycetoma caused by Microsporum canis in a Persian cat: lack of response to oral terbinafine

An eight-year-old neutered female Persian cat with a four-year history of r elapsing skin disease, characterised by ulcerated nodules with a yellow gra nular discharge, was examined. A diagnosis of granulomatous dermatitis and panniculitis (pseudomycetoma) caused by Microsporum canis was made on the b asis of history, clinical signs, histopathological examination of skin biop sy specimens and culture of macerated tissue. Because previous therapy, com prising repeated surgical excision and the administration of griseofulvin a nd itraconazole, had not been successful, terbinafine was administered for an eight-month period. However, lesions progressed despite this treatment a nd the cat was euthanased.