*Polypoid thickening of the inflamed nasal musosa, hyperplastic epithelium
−
*Pinkish, often pedunculated masses, round, often large and multiple proturberences into the nasal meatus
−
*Can arise subsequently to [[Rhinitis#Chronic rhinitis|chronic inflammation]]
−
*Old polyps may becoma fibrous
−
*May recur when excised
−
*Necessary to distinguish from neoplasia
−
*Common in cats, less often in dogs, also horses and sheep
−
*Also see [[Nasal Cavity Hyperplastic and Neoplastic - Pathology#Progressive ethmoidal haematoma|Progressive haematoma]] of horses and [[Nasopharynx Hyperplastic and Neoplastic - Pathology#Nasopharyngeal polyps of cats|Nasopharyngeal polyps]] of cats