Dense Breasts and Atypical Hyperplasia MRI guide for patients who want a clear answer before their next breast clinic visit. Learn when breast MRI may be considered after dense breast tissue, atypical ductal hyperplasia, atypical lobular hyperplasia, family history, genetic risk, or a high lifetime breast cancer risk score. This patient focused guide helps you understand what to ask your doctor, when MRI may be useful, and when mammography or other follow up may be enough.