NCI Dictionary of Cancer Terms

The NCI Dictionary of Cancer Terms features 8,409 terms related to cancer and medicine.

We offer a widget that you can add to your website to let users look up cancer-related terms. Get NCI’s Dictionary of Cancer Terms Widget.

unclassified sarcoma
(un-KLA-sih-fide sar-KOH-muh)
A group of rare cancers that do not look like other types of sarcomas under a microscope and may be hard to diagnose. They usually form in the muscles that are attached to bones and that help the body move. Unclassified sarcomas tend to grow quickly and spread to other parts of the body. Some types of unclassified sarcomas may form in a part of the body where a patient had radiation therapy in the past. An unclassified sarcoma is a type of soft tissue sarcoma. Also called undifferentiated sarcoma.