MacCallum, William George

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William George, U.S. pathologist, 1874-1944.
MacCallum patch - found in deep layers of the endocardium in patients with rheumatic fever.
MacCallum plaque - irregular thickness usually found in the left atrium in patients with rheumatic fever.
References in periodicals archive ?
Further histopathologic examination of the raised left atrial lesion demonstrated the characteristic features seen in a MacCallum plaque, or mitral regurgitation jet lesion, of bland, loose subendocardial fibrosis.