I have heard from a friend that went to MD Andersen there is a "nuclear" PET scan that is suppose to be better. They have to mix the material and use it within 2 hours. Not sure if Mayo offers this or not. I have never had that type of PET. I had a full axilla node dissection with 50 lymph nodes. Only sentinel node was positive. I understand the normal number of nodes is 25-30. I never had an MRI for breast only ultrasound.