If you have synovial sarcoma how would you know ? would you feel a lump?

Maybe: Synovial sarcoma is a diagnosis made by microscopic evaluation of biopsied tissue and special stains of tissue and possibly markers done on flow cytometric studies. You may feel an irregularity or bump, depending on the size of the questionable area. Put your mind at ease and be seen by your doctor.

Usually: Synovial sarcoma is a type of soft tissue sarcoma. It is very rare. Most patients notice a lump. While most soft tissue sarcomas are painless, synovial sarcoma will sometimes hurt. Rarely the lump is deep and not felt, so pain may be the only symptom. While most sarcomas grow with time, rarely synovial can be the same size for years. Most lumps are benign, but sarcoma has to be ruled out.