50.5 MB (1.3 MB compressed)
5157 x 3425 pixels
43.7 x 29.0 cm ⏐ 17.2 x 11.4 in (300dpi)
DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
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Salivary duct calculus (centre, white) in the submandibular salivary gland of a 73-year-old woman. A salivary calculus, known as a sialolith, is a hard, stone-like concretion of calcium mineral salts that forms within the ducts. This can block the gland and cause painful inflammation (sialitis), particularly when eating due to increased saliva production.
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