Dictionary.net

sarcoma of smooth muscle; occurs most often digestive tract or uterus or bladder or prostate

sarcoma of smooth muscle; occurs most often digestive tract or uterus or bladder or prostate

A sarcoma containing large spindle cells of smooth muscle. Although it rarely occurs in soft tissue, it is common in the viscera. It is the most common soft tissue sarcoma of the gastrointestinal tract and uterus. The median age of patients is 60 years. (From Dorland, 27th ed; Holland et al., Cancer Medicine, 3d ed, p1865)

A leiomyoma which has undergone sarcomatous degeneration; occurring most frequently as spindle-celled sarcomata of the uterus or the alimentary and genitourinary tract.