Eumycotic mycetoma due to Drechslera rostrata infection in a cow

A case of eumycotic mycetoma with lesions in the skin, nasal cavity and lymph nodes of a cow is reported. The case history, clinical course, macroscopic and microscopic appearance of lesions, and fungal isolation are described. Drechslera rostrata was isolated from pathological tissue and Koch's postulates were satisfied on mouse inoculation. This is the first infection of its type recorded in Australia and features contrasting with cases reported in other countries are discussed.