Epidemiological, clinical and anatomopathological characterization of nasal rhinosporidiosis in a horse

The objective of this study is to describe the clinical, epidemiological and anatomopathological aspects a case nasal rhinosporidiosis in horse Northeast Brazil. A 15-year-old female mixed breed presented nodule mucosa right septum. Surgical excision was performed sent for histopathological examination. Macroscopically, had an irregular reddish surface, when cut it soft, whitish, polypoid shape. Microscopically, myriads sporangia with endospores inside were observed lamina propria, morphologically similar Rhinosporidium seeberi various stages maturation. structures also evidenced marked by periodic acid Schiff (PAS), Grocott methenamine silver (GMS) toluidine blue. diagnosis made based on macroscopic confirmed through presence measuring 115 220 µm, containing its interior allowed diagnosis. Although considered rare Brazil, region there are descriptions disease humans, suggesting that animals occurs has possibly not been diagnosed. Therefore, important include as differential diseases affect cavity horses present lesions.