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49.3 MB (1.7 MB compressed)
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41.1 x 30.0 cm ⏐ 16.2 x 11.8 in (300dpi)
GJLP / SCIENCE PHOTO LIBRARY GJLP / SCIENCE PHOTO LIBRARY
Polyp. Coloured computed tomography (CT) scan showing a large polyp in a maxillary sinus. The two maxillary sinuses are air-filled cavities seen here as large black areas underneath the nasal cavity (top centre). The right maxillary sinus (left of image) is largely occupied by the polyp visible as a round blue area at centre left. Polyps are growths, usually benign, that protrude from a mucous membrane. They may need to be removed if they are responsible for symptoms or if they are likely to develop into a malignant growth. Other common sites of polyp formation are the lining of the nose, the cervix, the intestine and the larynx.
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