Case report 685: Ossifying fibromyxoid tumor of the soft parts of the upper arm.

We report an unusual case of an ossifying tumor arising in the deep soft tissue adjacent to the humerus of a 72-year-old woman. The tumor exhibited sarcoma-like features histologically, although its clinical course unexpectedly differed from that of a malignant tumor. We diagnosed this particular case as an ossifying fibromyxoid tumor of soft parts, which has been recently described by Enzinger et al.. This is another example of an ossifying soft-tissue tumor which simulates a malignant sarcoma.