testis tumors are rare , but it is the most common solid tumor in men under 45 years of age . although intracardiac metastases of testicular germ cell tumors occur rarely in clinics , they may lead to the congestive heart failure , paradoxical systemic emboli and vena cava superior syndrome with disseminated involvement of the right or left heart [ 25 ] . lung cancer and breast cancer are the most frequent tumors that lead to metastases to the heart . .   revealed that the most common metastatic sites for testicular carcinoma are the lungs , liver , brain , and bone whereas intracardiac metastases are found in less than 1% of patients . here , we report a patient with a prediagnosis of testis tumor and developed symptoms of the cerebrovascular accident and heart failure . a 38-year - old man admitted to hospital with the complaint of swelling in the left testis for the last 3 months . scrotal ultrasonography revealed heterogeneous and hypoechogenic solid mass lesion in the left testis with 9 x 6 cm dimensions . thoracic computed tomography ( ct ) showed many bilateral parenchymal metastatic lesions in the lungs , the biggest one was 7 x 9 x 11 cm in dimensions and located in the left upper paramediastinal region ( fig . serum -hcg was 89.7 iu / ml and afp was 1050 ng / dl . computed tomography of thorax shows extension of metastatic mass in the lung to the left atrium via left lower pulmonary vein and the filling defect created by it while the patient had been followed up by the medical oncology department , a cerebrovascular accident ( cva ) developed and symptoms of nyha class 4 heart failure were detected . echocardiography revealed a mass attached to the mitral valve with 18 x 52 mm in dimensions and filling two thirds of the left atrium . mass image in the left atrium by echocardiography under general anesthesia , after median sternotomy , cardiopulmonary bypass was started with bicaval cannulation . left atrium was explored and a 5 x 3 cm pedunculated fragile mass was seen in the left atrium . the pedicle was extending to the left lower pulmonary vein and was probably a part of metastatic mass in the left lung . the left atrial space was irrigated by saline after excision and there was no residual mass . b ) macroscopic appearance of the mass after excision the patient was taken to the postoperative intensive care unit for 1 day and discharged on the 6 postoperative day . he was taken to the medical oncology department for therapy . symptoms of the patient declined to nyha class 1 postoperatively . pathologic examination of the left atrial mass with a large amount of polypoid tissue revealed hypocellular mesenchymal tissue consistent with a non - seminomatous germ cell tumor metastasis . microscopically teratoid glandular and ductular structures lined by columnar or squamous epithelial cells were seen in an edematous and hemorrhagic fibrous stroma . immunohistochemically , while teratoid areas were stained with pankeratin , choriocarcinoma areas were stained with hcg ( fig . d ) choriocarcinomatous component was stained with hcg antibodies ( x100 ) metastatic testicular germ cell tumor was diagnosed and bep ( bleomycin , etoposide , cisplatin ) chemotherapy protocol was started 15 days after the surgery . the patient did not have any problem in wound healing during the follow - up . the thoracic ct at sixth month 's control showed regression in the pulmonary mass and no recurrence in the cardiac cavity ( fig . computed tomography shows regression of metastatic mass in the lung and no filling defect in the cardiac cavity testicular tumors are among the tumors with the best therapy success and the longest survival . five - year survival rate is 90% without distant metastases and 60% with distant metastases . cardiac metastases are rare in malignant tumors and their incidence ranged between 1.5% and 18.3% in various reports . based on autopsy reports of 1029 patients with malignancy , the most frequent metastasis occurs in pericardium and the most frequently metastasizing tumor is lung cancer which is followed by lymphoma , breast cancer and esophagus cancer . the most common sites of metastasis in testis tumors are paraaortic lymph nodes , mediastinal lymph nodes , lungs and supraclavicular fossa . the incidence of metastatic involvement of cardiac endothelium and valvular surface due to testis tumors is 3.8% and it is considered that hematogenous spread via vena cava inferior is the main route . chest pain , newly developed effusion , symptoms of tamponade , increase in the dimensions of the heart , new murmurs , new electrocardiography ( ecg ) changes and unexplained cardiac failure may point out to cardiac metastasis in patients with a neoplastic disease . in addition , dizziness , hypotension , loss of consciousness , and seizure may indicate embolization to the brain and intracardiac mass . in literature , cases of right atrial mass and right heart failure are more common , but our case showed left atrial mass and symptoms of left heart failure . there was no recurrence at the postoperative 6 month follow - up visit . in conclusion , cardiac output can be corrected by radical cardiac surgery in malignant germ cell testicular tumors with cardiac involvement . although cardiac involvement has been related to short survival and worse prognosis , tumor type , tumor marker levels and the number of metastatic sites may affect prognosis . the resulting clinical status in this patient encouraged us to conclude that a patient with disseminated cancer can be operated for treatment purposes . developments in imaging techniques and surgical methods enable curative treatment choices in such patients during metastatic stages .