Myxosarcoma is a rare malignant tumor of the heart. ...
A sarcoma, usually a liposarcoma or malignant fibrous histiocytoma, with an abundant component of myxoid tissue resembling primitive mesenchyme containing connective tissue mucin. ... (12 Dec 1998) ... 
(mik″so-sahr-ko´mә) a sarcoma containing myxomatous tissue.
Type: Term Pronunciation: mik′sō-sar-kō′mă Definitions: 1. A sarcoma, usually a liposarcoma or malignant fibrous histiocytoma, with an abundant component of myxoid tissue resembling primitive mesenchyme containing connective tissue mucin. Synonyms: myxoma sarcomatosum
myxosarcoma A sarcoma characterized by immature, relatively undifferentiated cells that grow rapidly and invade extensively, resulting in tissue that resembles primitive mesenchymal tissue.