[Massive intraatrial mass?].

Posterior mediastinal hematoma in a rare and potentially lethal disease and is frequently consecutive to a traumatism. We report the original case of a 88-year-old male admitted to our department for lipothymia and syncope related to a severe compression of the left atrium by an important mediastinal hematoma mimicking in transthoracic echocardiography an obstructive intraatrial mass.