A 5 year-old male Throughbred horse housed in Korean Racing Association died after having enteritis and respiratory disorder for about 10 days. At necropsyi the left and right caudal lung lobes were reddenedi swolleni and contained numerous well-defined sublobular consolidated foci. The large intestine was diffusely reddened and covered with pseudomembranous exudates. Microscopicallyi multifocal areas of necrosis with mild to moderate infiltration of neutrophilsi macrophages and Iymphocytes as well as hemorrhage and edema were noted in the lung. The fungi having conidiophorei dome-shaped vesicles phialides and conidia which are characteristic of Apergillosis fumigatus was isolated from the lung. The colonic mucosa was transmurally necrotic and severe congestions edema and thrombi were observed in the submucosa. The embolic mycotic pneumonia present in this case Probably occured secondary to antibiotic therapy given for treatment of enteritis.