The first lump moves around and is solid. I got an ultrasound for it.

This new lump is bigger and also moves around. The ultrasound missed this lump or didn't see it.

They say my first lump is a benign tumor, because it looks like a fibroadenoma on ultrasound, but the truth is that one can't tell whether a solid lump is cancerous or not by ultrasound alone. The ultrasound can show whether it is solid or not.