Nasal aspergillosis. Tissue from an 8 year old, neutered male thoroughbred horse with an initial history of sinusitis leading to progressive neurological signs (ataxia, behavioural abnormalities) and prolonged recumbency. Necropsy examination reveale

Nasal aspergillosis. Tissue from an 8 year old, neutered male thoroughbred horse with an initial history of sinusitis leading to progressive neurological signs (ataxia, behavioural abnormalities) and prolonged recumbency. Necropsy examination revealed a focus of grey-caseous material within the right nasal chamber that comprised a mat of branching, septae fungal hyphae and mixed inflammatory cells (haematoxylin and eosin stain). Aspergillus spp was cultured from the lesion. There was no gross or histologica