Malignant fibrous histiocytomas (MFH) are malignant tumors (sarcomas) that grow in the soft tissues or bones. They are the most common type of sarcomas affecting soft tissues, but rare if they grow in a bone. In 2002, the World Health Organization changed the name of this type of tumor to undifferentiated pleomorphic sarcoma because research has yet to reveal the cell type from which it grows. However, experts still use the term malignant fibrous histiocytoma or MFH.
The main symptom of a malignant fibrous histiocytoma is a palpable lump or mass. These types of tumors are most likely to occur in the limbs, hands, or feet. MFH tumors tend to grow very quickly and may appear reddened and feel warm to the touch. Some MFH tumors cause pain, while others cause no discomfort at all.
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