Secondary cardiac tumor is actually a metastasis to the heart. These types of tumors are rare, and usually lung cancer (bronchial cancer) and breast cancer spread metastasis to the heart.
Metastasis to the pericardium (thin double-layered sac enclosing the heart) is followed by chest pain, pericardium inflammation and cardiac tamponade.
Metastasis to the myocardium (heart muscle) is followed by disturbed heart rhythm and impaired cardiac conduction, heart failure, and sometimes heart attack.
Endocardial metastasis reflects altered hemodynamics, valve failure and systemic and pulmonary embolisms.