Definitions

microabscess

Janeway lesion

Janeway lesions are non-tender, small erythematous or haemorrhagic macular or nodular lesions on the palms or soles only a few millimeters in diameter that are pathognomonic of infective endocarditis. Pathologically, the lesion is described to be a microabscess of the dermis with marked necrosis and inflammatory infiltrate not involving the epidermis, which is due to the deposition of circulating immune complexes in small blood vessels.

They are named after Edward G. Janeway (1841–1911), a professor of medicine with interests in cardiology and infectious disease.

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