Metastatic osteosarcoma near-totally occluding the right atrium: A rare cause of cardiovascular emergency

Emergency surgical treatment of metastatic cardiovascular tumors is rarely required in cardiovascular surgery. Metastatic cardiovascular tumors constitute a small portion of open-heart surgeries. Intracardiac metastasis of osteosarcomas is much less common. Herein, we present the diagnosis and management of dyspnea, cyanosis, and respiratory failure secondary to near-total occlusion of the right atrium due to right humerus metastatic osteosarcoma in a 21-year-old female patient.