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Transthoracic echocardiography apical four-chamber view of a dysfunctional mechanical, mitral prosthetic valve with intravalvular thrombus; white arrows: Hyperechoic effect beyond the level of the prosthetic thrombotic valve; white head arrow: Aliasing effect on color Doppler box due to blood flow turbulence related to prosthetic dysfunction because of intravalvular mass
