Surgical Resection of a Metastatic Lung Tumor with Polypoid Extension Into the Left Atrium Using the Bilateral...

Lung tumor with polypoid extension into the left atrium (LA) poses a high systemic tumor embolism risk. We report a rare case of a woman with pulmonary metastasis from a retroperitoneal leiomyosarcoma extending into the LA as a polypoid mass through the left superior pulmonary vein. To minimize the risk of fatal embolization, complete resection was performed under cardiopulmonary bypass using a bilateral transseptal approach, enabling excellent visualization and precise intracardiac tumor resection before left upper lobectomy. She has remained recurrence free for 1 year. This approach safely manages lung tumors with polypoid LA invasion while mitigating catastrophic tumor embolism risk.