Surgical treatment of primary malignant fibrous histiocytoma of the left atrium.

A 30-year-old patient was operated on as an emergency because of a left atrial tumor. Microscopic and electron microscopic examination of the tumor revealed it to be a myxoid variant of a malignant fibrous histiocytoma. The tumor subsequently recurred, and the recurrence was recognized by echocardiography. The patient died 21 months after initial operation.