39.3 MB (2.2 MB compressed)
4356 x 3150 pixels
36.8 x 26.7 cm ⏐ 14.5 x 10.5 in (300dpi)
CC, ISM / SCIENCE PHOTO LIBRARY CC, ISM / SCIENCE PHOTO LIBRARY
Infected maxillary sinus. Computed tomography (CT) scan through the front of the head, at the level of the maxillary sinuses, of a patient with sinusitis (inflammation of the paranasal sinuses). Such inflammation is often due to infection. This is an axial slice, passing horizontally through the head, with the front of the head at bottom. The two maxillary sinuses, located in the maxillae (the cheekbones), are the spaces at right (black, clear) and left (blue, blocked), either side of the nose and ethmoid sinuses. The paranasal sinuses are membrane-lined air-filled spaces in the bones of the face. They drain mucus into the nose and throat. The indirect cause of the infection in this cases is polyposis (large number of polyps) in the left nasal passage.
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