Intimal Sarcoma: An Extremely Rare Case of a Left Atrial Tumor with Partial Obstruction of the Mitral Orifice

• Primary malignant cardiac tumors are very rare. • This is the first case report of intimal sarcoma of left atrial origin. • Echocardiographic diagnosis of malignant cardiac tumor is critical but challenging. • The authors outline the differentiation of primary malignant cardiac tumors.