Hi jmc! Sorry I did not see your post until now. To give my opinion, yes, I would want a biopsy and copy of the records. A biopsy is the only 100% way to know. If it is nothing, then you can have peace of mind. If not, them catching it sooner is always better. 80% of lumps are benign so the odds are in your favor, and sometimes microcalcifications can be hiding a lump. If I were you I would insist on a biopsy. Please let us know how it goes at the doctors today, we care!