The prevalence of atrial fibrillation in the general Spanish population older than 40 years is high, at 4.4%. The prevalence is similar in both sexes and rises steeply above 60 years of age. It is estimated that there are over 1 million patients with atrial fibrillation in the Spanish population, of whom over 90,000 are undiagnosed.

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SummaryWe report the case of a 32-year-old patient with a left atrium myxosarcoma, presenting with congestive heart failure. It is a rare cardiac malignant primary tumor that seems to derive from the same cellular line as myxomas, but the prognosis is very different. These tumors present local recidives and distance metastasis, so the mean survival is about 1 year, independent of any therapeutical option.

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