[Diagnosis using bidimensional echocardiography in a free thrombus of the left atrium].

Left atrial thrombosis in patients with rheumatic mitral valve disease is frequent. It is important to establish an early diagnosis particularly in those patients who had previous thromboembolic episodes. We describe the case of a sixty-year-old woman with pure mitral stenosis and free left atrial thrombus. We emphasize the sensitivity and specificity of bidimensional echocardiography in such conditions.