Blastemykose in horse

This is a tumorous granuloma developing in the nasal cavity or paranasal sinuses of horses due to a type of Blastomyces that was first detected in Japan. Before death, this horse showed bleeding from the nasal cavity and swelling in the occipital and frontal regions and the upper jaw, suggesting empyema. Autopsy revealed light yellow transparent soft fat-like tissue masses in the left frontal sinus and the nasal cavity. Microscopy of this tissue showed round Blastomyces varying in size.

Masanobu Goryo
Address inquiries to the following.
Department of Veterinary Pathology, Faculty of Agriculture, Iwate University., Morioka, 020-8550, Japan