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Types of uterine sarcoma

A sarcoma is a cancer of the bone, cartilage, fat, muscle, blood vessels, or other connective or supportive tissue.

There are three types of uterine sarcoma: leiomyosarcoma, endometrial stromal sarcoma and mixed Müllerian sarcoma.

  • Leiomyosarcoma. This type of cancer begins in the smooth muscle cells that form the walls of the uterus.
  • Endometrial stromal sarcoma. This type of cancer begins in the connective tissue cells of the stroma, which supports the lining of the uterus (the endometrium).
  • Mixed Müllerian sarcoma. This is sometimes called a carcinosarcoma. A carcinosarcoma is a mixture of carcinoma (cancer of epithelial tissue, which is skin and tissue that lines or covers the internal organs, such as the endometrium) and sarcoma (cancer of connective tissue, such as bone, cartilage and fat).

How common is uterine sarcoma?

Uterine sarcoma is a very rare type of cancer. It usually occurs after menopause.