mitralization

Straightening of the left heart border on a chest radiograph due to prominence of the left atrial appendage or the pulmonary outflow tract; an unreliable indication of mitral valve disease.

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mi·tral·iza·tion (mi″trəl-ĭ-zaґshən) straightening of the left border and prominence of the pulmonary salient of the cardiac shadow, a configuration commonly seen radiographically in mitral stenosis.