BACKGROUND: Clinically evident cardiac metastases from malignant neoplasms are uncommon. The frequency of thyroid metastasis to the heart is very low. To our knowledge, over the last 20 years only a few cases have been reported in the entire literature. Metastatic cardiac involvement occurs most often during the terminal stage. PATIENTS: We present three cases of anaplastic thyroid cancer with metastatic involvement of the heart. RESULTS: Two of the patients died from cardiac problems. The absence of early symptoms makes the clinical diagnosis of metastatic carcinoma difficult. CONCLUSIONS: Anaplastic thyroid cancer is an aggressive cancer with a dismal prognosis. It should be borne in mind as a source of cardiac metastasis and a cause of cardiac death.

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