A giant, free-floating mass in the left atrium in a patient with atrial fibrillation.

A large intracardiac mass is a rare condition and one with an extremely high risk of haemodynamic and embolic complications. Urgent surgical excision is the treatment of choice, and the histological examination reveals the exact nature of the mass, usually a myxoma or a thrombus. We present the case of an 80-year-old woman, with a history of atrial fibrillation, who was admitted because of a seriously impaired level of consciousness, and fever.