Renal Cell Carcinoma Metastasis to the Left Atrium.

Only 13 cases of renal cell carcinoma metastasis to the left atrium of the heart have been described. We report the case of a man in his 50s who had undergone radical nephrectomy for renal cell carcinoma in 2006 and presented with amnesia at our neurology department in 2020. Magnetic resonance images of the brain showed metastatic lesions; subsequent computed tomograms of the chest, abdomen, and pelvis revealed a mass in the left atrium and multiple metastases in the lung, pleura, and pancreas. Our cardiologists advised against surgical removal of the left atrial mass because of a poor prognosis, so radiation therapy and immunotherapy were initiated instead.