[Left bundle-branch block and primary benign heart tumor].

The electrocardiogram (ECG) of a 56-year-old woman suffering from insomnia and nervousness revealed left bundle branch block, an ECG two years previously having been normal. Echocardiography showed a perimyocardial space-occupying lesion in the area of the left ventricle. Magnetic resonance imaging demonstrated a 6 x 6 x 7 cm solid tumour, which could not be separated from the myocardium of the dorsal portion of the ventricle and the left atrial wall. Coronary angiography demonstrated a few small atypical vessels originating from the right coronary artery. An endomyocardial biopsy was equivocal. An exploratory thoracotomy revealed a large, livid tumour which could not be resected because it involved a large area of the left ventricle and left atrium. Surgical biopsy showed a cavernous haemangioma. The subsequent course (ten months' follow-up) has so far been unremarkable.