a sack of inflamed tissue that grows out from the sinuses
A small, pearly-gray, stalk-like growth from the epithelial surface inside the nose.
a small rounded piece of the lining of the nose that can extend into the passages of the nose.
Nasal polyps are polypoidal masses arising mainly from the mucous membranes of the nose and paranasal sinuses. Nasal polyps are usually classified into antrochoanal polyps and ethmoidal polyps. Antrochoanal polyps arise from the maxillary sinuses and are much less common, ethmoidal polyps arise from the ethmoidal sinuses.