JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
Light micrograph of a typical granuloma (inflamed nodule) in a human lung with tuberculosis. At centre is an area of dead tissue (caseous necrosis) surrounded by a chronic inflammatory infiltrate. In the upper region are two typical Langhans giant cells. Magnification: x90 when printed at 10 centimetres wide.
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