[Left atrial thrombi manifesting clinically as an annular thrombus].

The authors present a case diagnosed while still living, as an annular thrombus in the left atrium with the presence of a "pure" mitral stenosis. At necropsy, two thrombi were found, one of them "traveling", situated very close to each other, providing conditions for a complete obstruction of the mitral opening and imitating the respective clinical picture.