CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
Inflamed arterial tissue. Light micrograph of a section through tissue from an artery in a case of Horton's disease, also named giant cell arteritis. This sort of arterial inflammation (arteritis) is caused by immune system reactions. It is diagnosed by the presence of giant cells (one at centre) in the artery wall. The condition usually affects the cranial and temporal arteries of the head in the elderly, causing headaches. Magnification unknown.
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