Mitral annular calcification (MAC) is a common echocardiographic finding. Caseous calcification is a rare variant appearing as a round, tumor-like mass with central echolucent area located in the periannular region. Although occasionally misdiagnosed as a tumor and submitted to exploratory cardiotomy, this lesion appears to carry a benign prognosis. The true significance of caseous calcification is unknown; it might be an early and reversible stage of MAC or an atheroma-like lesion. We describe a case of caseous calcification with spontaneous resolution in a 60-year-old woman-such a finding should be considered in the differential diagnosis of intracardiac masses.
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