[Spontaneous remission of a vascularized left atrial space-occupying lesion].

We report on a 73-year-old woman with mitral stenosis and an echocardiographically and angiocardiographically proven vascularized mass at the superior part of the left atrium. The patient was put on anticoagulation with phenprocoumon. An echocardiographical follow up 10 months later revealed the disappearance of this mass; only a stalklike structure was present at the site of the former mass. Clinical presentation, echocardiographic and angiocardiographic findings are consistent with a vascularized atrial thrombus. Nevertheless, currently available imaging procedures cannot definitely discriminate vascularized thrombus, myxoma and hemangioma.