Small Cell Lung Cancer Invading the Left Atrium With Subsequent Malignant Embolic Stroke: A Case Report and Review of Literature.

Cardiac tumors are uncommon, and the vast majority of them are metastases from extracardiac sources. Metastatic spread to the heart causes symptoms by mechanical obstruction of circulation, direct myocardial invasion, or distal embolization. We herein report a case of a 58-year-old male who presented to the hospital with multilobar intracranial embolic infarcts who was found to have small cell lung cancer (SCLC) with invasion of the left atrium and pulmonary artery resulting in malignant embolic stroke. Cerebral tumor thromboembolism from SCLC is extremely rare. This case demonstrates the thromboembolic risk associated with metastatic endoluminal cardiac tumors.