Enhancement on "good" side

clavelle

I'm a little over 4 years post-diagnosis for ER+ Her2+ IDC in my left breast and last week I had my annual MRI. The good news is my bad boob looks great! But for the first time my right breast lit up and they're calling me back in for MRI-guided vacuum biopsies. There's "marked parenchymal enhancement" in the right breast and two non-mass enhancements: 2.9 x 1.7 x 2.5 cm focal clumped non-mass enhancement with persistent kinetics in the right upper outer breast, 10:00; linear non-mass enhancement in the right breast at 9:00, from middle to posterior depth spanning up to 3.7 cm in AP dimensions and 0.9 cm lateral to this, there is additional 2.7 cm linear non-mass enhancement.

I was diagnosed just after I turned 36 and taking a break from hormone therapy to try to conceive has always been in the plans. I stopped tamoxifen in December with the plan to use the eggs I froze before chemo, but ultimately my husband and I decided we weren't quite ready, and I went back on about two weeks ago (so I was off for about four months total).

My gut feeling is that this is related to me having stopped tamoxifen, not necessarily that there's anything sinister, just that I've been on either Zoladex and exemestane or tamoxifen for so long and this is the first time I've had an MRI with hormones running wild. It's my understanding that a temporary spike in estrogen could be causing the parenchymal enhancement, but I am worried about the clumped and linear enhancement.

Has anyone had an unusual MRI or biopsies after stopping medication?