I am a 24 year old woman. Last week my husband discovered a large, irregular, fleshy lump about 4 inches above my knee on my outer thigh. It is not painful, and I have no idea how long it has been there. I saw a PA for examination this morning, and she sent me directly to have an ultrasound done. She also suggested that I have a needle aspiration done at the same time, but I declined. I wanted to know the ultrasound results before deciding on any kind of biopsy, etc.
The person who did my ultrasound (I'm not sure if she was a radiologist or a sonographer or what) said that although she felt the lump and could see it on my leg, the ultrasound found nothing at all there. She said that it was probably just some kind of fatty deposit or lipoma-like thing, and that a needle aspiration would make no sense, because you can't biopsy what you can't see. She suggested an MRI (although she seemed unconcerned), but I am not convinced that this mass needs further evaluation.
Here are my questions:
1. Does a negative ultrasound rule out most malignant soft tissue tumors and other dangerous masses?
2. Do you think further testing would be a good idea?
3. If this is a lipoma or just an area of fatty deposit, is it going to get bigger?