ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Salivary stone. Coloured X-ray of a section through the right lower jaw of a 70-year-old patient, showing a very large calculus (stone, oval, centre) in the submandibular salivary duct (Wharton duct). Salivary stones (sialolithiasis) are calcified masses that form within a salivary gland or duct. They can cause pain and swelling of the affected area and are usually removed.
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