Free-floating tumor thrombus in the left atrium associated with non-small cell lung cancer.

A free-floating tumor thrombus in the left atrium is an unusual metastasis of non-small cell lung cancer. Surgical resection of free-floating tumor thrombus prior to adjuvant therapy relieves cardiac symptoms such as exertional dyspnea, and prevents life-threatening complications including systemic embolization, mitral obstruction, or sudden death.