jet lesion

jet lesion

localized areas of subendocardial fibrosis, usually in the atria, thought to be due to abnormal jets of blood caused by valvular lesions.
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.