@resort I believe why a biopsy gives a diagnosis of ADH is because there is actual atypia, but the pathology report from your mastectomy came back as no ADH is that the ADH was removed during the initial biopsy. I had a diagnosis of atypical lobular hyperplasia (ALH) from a biopsy, but after an MRI, no ALH was noted. I was told that it might have been removed during the biopsy. Sorry you went through all of that.