Nasal polyps are polypoidalmasses arising mainly from the mucousmembranes of the noseand paranasal sinuses. They are overgrowths of themucosa that frequently accompany allergicrhinitis. They are freely moveable and non-tender.
Nasal polyps are usually classified into antrochoanal polyps and ethmoidalpolyps. Antrochoanal polyps arise from the maxillarysinuses and are the much less common, ethmoidal polyps arise from the ethmoidalsinuses. Antrochoanal polyps are usually single and unilateral whereasethmoidal polyps are multiple and bilateral.
Symptoms of polyps include nasal block, sinusitis, anosmia (that is,loss of smell), and secondary infection leading to headache. Despite removal by surgery,nasal polyps are found to recur in about 70% of cases. Sinus surgery requiresgreat amount of precision as this involves risk of damage to orbit matter.
The tendency to manifest multiple polyps is referred to as “polyposis”.