We report a case of pulmonary adenosquamous carcinoma with a tumor thrombus in the left atrium. The left atrial tumor thrombus and lung cancer were removed via a right pneumonectomy and atriotomy under cardiopulmonary bypass. Simultaneous resection of a left atrial tumor thrombus and lung cancer can prevent systemic embolization, mitral obstruction, and sudden death, and improve the prognosis in selected patients.
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