Malignant Mixed Mullerian tumors (MMMT) are rare gynecological tumors. Even with surgical treatment, chemotherapy, and/or radiotherapy, outcome is poor. MMMTs are known to metastasize to the liver, the abdomen, and the lungs. One case of an ocular metastasis has been reported. In a 61-year-old female patient who had undergone surgical resection of a Mullerian tumor of the uterus 26 months prior to being admitted to our department, we found an obstructing left atrial mass. Histopathologic assessment of this lesion after surgical resection revealed a Mullerian tumor metastasis. Immediately after surgery, the patient was asymptomatic, but was readmitted 4 months later with dyspnoea. Echocardiography and CT revealed new masses in the left atrium and left ventricle. On a literature review, we did not find any description of left atrial and left ventricular occluding metastases of MMMT.

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