I was diagnosed with invasive lobular ancer in 2021. Waiting for all the testing to be done is torturous! I was at a large medical center in Colorado where the testing was done quickly (but felt like forever). Following the mammogram and ultrasound, I also had a Body MRI and Bone MRI. I thought those were standard test and they might be for invasive lobular as it is a tricky cancer to dx.
So much depends of the "driving force" of the cancer: ER, PR and/or HER2 + or-. That will determine your treatment.
I wish you well and stay connected.