Myosarcoma is a malignant muscle tumor. Leiomyosarcoma refers to sarcoma of smooth muscle, and rhabdomyosarcoma refers to sarcoma of striated muscle. However, the term myosarcoma itself still appears in the literature. People who suffer from myosarcoma often wake up with the feeling as if they had a cramp during their sleep. ... Found on http://en.wikipedia.org/wiki/Myosarcoma
(from the article `sarcoma`) ...the latter being much less common. Because mesenchymal cells form a variety of mature tissues, tumours may have the characteristics of bone ... Found on http://www.britannica.com/eb/a-z/m/147