A 37-year-old man with hairy cell leukemia was found incidentally to have a right inguinal hernia. Microscopic examination of the resected herniorrhaphy specimen disclosed dense transmural infiltration by hairy cells. Electron-microscopic and immunoperoxidase studies confirmed the presence of surface cytoplasmic projections and B cell phenotype, respectively, of the infiltrating cells. This case is, to our knowledge, the first reported instance of hairy cell leukemia involving a hernial sac and demonstrates the capacity of hairy cells to infiltrate unexpected soft-tissue sites.
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© 1990 S. Karger AG, Basel
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