CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
Lung tissue hyperplasia. Light micrograph of a section through lung tissue showing mesothelial hyperplasia in the pleura, the membrane that lines the lungs and inner chest wall. Hyperplasia is the abnormal growth of a tissue or organ due to an increase in the number of cells it contains. The mesothelium is a layer of cells in the pleura. This condition is benign (non-cancerous), but may be mistaken for the cancerous mesothelioma (a cancer of the mesothelial cells) in a biopsy. Magnification unknown.
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