ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Skull in Erdheim-Chester disease. Coloured computed tomography (CT) scan of an axial section through the head of a 28-old patient with Erdheim-Chester disease, showing osteosclerosis and bone erosion at the base of the skull. Erdheim-Chester disease is the abnormal proliferation of histiocyte white blood cells, which causes osteosclerosis - increased bone density.
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