Lump and enlarged lymph node

Mb123

I had dcis (grade 3) treated with double mastectomy 5 years ago. So recurrence isn't likely but I am concerned about a new finding on the opposite side.. I have a 1.24 cm solid mass below my left axilla and an enlarged lymph node in the same axilla. Both have been biopsied and now waiting for results. Prior to the dcis I had fibroadenomas and extensive fibrocystic breast disease. Anyone have a fibroadenoma in residual breast tissue after mastectomy? Thinking of benign possibilities.