Background: Secondary cardiac tumors are far more frequent than primary tumors. Cardiac metastasis of osteosarcoma is extremely rare. Case Presentation: We report a 14-year-old child with left femur osteosarcoma that had metastasized to the left ventricle after 30 months of follow-up. The diagnosis was confirmed based on the findings of transthoracic echocardiography and fluorodeoxyglucose positron emission tomography/computed tomography. Surgical removal was indicated in the patient, but his parents refused this decision, and the patient was discharged and admitted to a pediatric oncology center for chemotherapy. The patient died after four courses of chemotherapy. Conclusion: Cardiac metastasis of osteosarcoma is a strong predictor of disease. The demographic differences shown in our case include male sex and a short interval between onset and cardiac involvement.

Background: Cardiac involvement in polymyositis is often asymptomatic. Electrocardiogram (ECG) remains a cornerstone for the screening of conduction disturbances and other electrocardiographic abnormalities. Case presentation: We report the case of a 35 year-old-woman with polymyositis complicated with a complete atrioventricular block 10 years after the beginning of her symptoms. She was admitted to the hospital for syncope and benefited from a pacemaker insertion without incident. Conclusion: Cardiac effects of polymyositis are associated with poor prognosis and might appear in patients in remission of the disease.

Background: Recurrence of sporadic cardiac myxoma remains unusual but the seriousness of the situation justifies the realization of a surgical resection as complete as possible with post-operative clinical and echocargdiographic monitoring. Case presentation: We recall the case of myxoma of the left atriumin a 64-year-old women complicated by functional mitral stenosis and heart failure. She underwent urgent heart surgery, during which a friable tumor attached by a sessile base to the anterior atrial septum was removed. The postoperative effects were complicated by a pulmonary embolism. Eight months later, the patient consulted for exertional dyspnea with an echocardiographic image in favor of a recurrence of myxoma of the left atrium. Conclusion: Several mechanisms have been proposed to explain such recurrence, the most avoidable remain incomplete surgical resection and Implantation of embolic fragments of the original tumor in the myocardium due to a previous surgery.

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