Pseudallescheria boydii infection of the nasal cavity of a horse

An 18-year-old 454-kg (1,000-lb) American Quarter Horse gelding was evaluat ed because of chronic intermittent malodorous right-sided nasal discharge. Endoscopy revealed a mycotic plaque in the nasal cavity adjacent to the nas omaxillary opening of the right caudal maxillary sinus. The nasomaxillary o pening appeared to be larger than normal. Fungal culture of specimens of th e mycotic plaque yielded Pseudallescheria boydii. The horse was treated wit h 2% miconazole intranasally, sodium iodide IV, and potassium iodide PO. Th irty and 60 days after treatment was initiated, the nasal cavity was found to be free of infection.-P.