A 22-year-old athlete complained of palpitations shortly after a chest trauma during a basket competition. His electrocardiogram showed a ventricular tachycardia of 250 beats per minute, reverted to sinus rhythm with a chest thump. Standard electrocardiogram was normal. The following days he had an enzymatic pattern consistent with acute myocardial infarction, and the echocardiogram evidentiated an apical hypokinesia with a mural thrombosis. The patient recovered completely; and 15 days after the acute event, a coronary arteriography and ventriculography did not revealed any abnormality.