I am a 50 year old woman, I found a large lump that popped up suddenly on my right leg, just above and to the right of my knee. It is not painful. It is not soft like a lipoma. I am scheduled for an MRI but not a biopsy. According to all of the information that I have read about this, it is likely a malignancy. It is currently the size of a cherry tomato and when I am in a squatting position where the muscle is engaged, it protrudes. Why did I get scheduled for an MRI and not a biopsy if it is most likely a cancer? What else could it be if not cancer or lipoma?