*May manifest as [[Nasal Cavity Hyperplastic and Neoplastic - Pathology#Nasal polyps|nasal polyps]], [[Nasal Cavity Hyperplastic and Neoplastic - Pathology#Progressive ethmoidal haematoma|progressive haematoma]] in horses and [[Nasopharynx Hyperplastic and Neoplastic - Pathology#Nasopharyngeal polyp of cats|nasopharyngeal polyp]] of cats | *May manifest as [[Nasal Cavity Hyperplastic and Neoplastic - Pathology#Nasal polyps|nasal polyps]], [[Nasal Cavity Hyperplastic and Neoplastic - Pathology#Progressive ethmoidal haematoma|progressive haematoma]] in horses and [[Nasopharynx Hyperplastic and Neoplastic - Pathology#Nasopharyngeal polyp of cats|nasopharyngeal polyp]] of cats |