Left Atrial Malignant Fibrous Histiocytoma with Right Atrium Invasion

Background: primary cardiac tumors are rare (0.001 to 0.03%). malignant tumors account for 25%, of which 75% are cardiac sarcomas. case persentation: here, we report a case of a 57-year-old male with palpitation and history of left atrial (la) myxoma resection presented to cardiology clinic for postsurgical follow up and transthoracic echocardiography revealed a large non-homogenous mass in la with right atrium invasion, which was confirmed by trans-esophageal echocardiography. the patient underwent surgical resection of tumor and the pathological diagnosis was malignant fibrous histiocytoma (mfh). conclusion: mfh could be asymptomatic and the diagnosis be established as a surgical or complementary examination. in patients with history of myxoma resection and cardiac masses, further evaluation is recommended.