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Left ventricular free wall rupture is one of the most catastrophic and lethal mechanical complications associated with myocardial infarction. Its diagnosis in a patient still alive is rare, and its only therapeutic option is open surgical treatment. We report the case of an 82-year-old male patient who presented with an acute ST-segment elevation myocardial infarction, within more than 24 hours of onset, in which it was possible to record, in real time, the rupture of the left ventricular free wall by means of ventriculography.