CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
False-colour computed tomography (CT) scan of an axial section through a head, showing the location of a nasal polyp. In this view from below, a polyp (red) can be seen in the left nasal fossa (upper centre right). The nasal cavity is purple at centre. Orbits of the eye appear as faint circles on either side of the nose. Nasal polyps are usually benign growths that protrude, stalk- like, from the mucous membrane lining the passages of the nose. Irritation from tobacco smoke is implicated as a cause, and they are often present in patients with allergic rhinitis. Giving rise to nasal blockage, they can be surgically removed.
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