Leiomyosarcoma

Leiomyosarcoma is a type of sarcoma which is a neoplasm of smooth muscle. (When benign, it is called a leiomyoma.) Smooth muscle cells make up the involuntary muscles, which are found in most parts of the body: in uterus, stomach and intestines, walls of all blood vessels, and skin. Leiomyosarcoma is a very rare cancer. It makes up 7% of soft tissue sarcomas.
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Leiomyosarcoma /leio·myo·sar·co·ma/ a sarcoma containing spindle cells of smooth muscle. lei·o·my·o·sar·co·ma n. [more]Leiomyosarcoma - Community and Resources

Noun
1. sarcoma of smooth muscle; occurs most often digestive tract or uterus or bladder or prostate
(hypernym) sarcoma

a malignant tumor of smooth muscle origin. Smooth muscle is the major structural component of most hollow internal organs and the walls of blood vessels. Can occur almost anywhere in the body but is most frequent in the uterus and gastrointestinal tract. Complete surgical excision, if possible, is the treatment of choice.

A malignant (cancerous) tumor of smooth muscle cells thatcan arise almost anywhere in the body, but is most common in the uterus, abdomen, or pelvis.