I’m not sure if I’m understanding correctly... have you not had the opposite breast mammogrammed at all? Surely that’s a given at work up when diagnosed as ILC has a higher chance of being contralateral instead of unilateral?
I ended up asking my GP for a breast MRI @berry, my surgeon didn’t think it was needed but I wanted peace of mind as my opposite boob very young dense lumpy tissue.
I listened to a presentation from the US lobular group recently and they said MRI very useful to ILC if available to the patient (cost, regional location etc are factors hindering this). Note not everyone gets these due to such factors/doctor preference.
I would insist on having a mammogram at a minimum if it were me.
Take care