I too was just diagnosed with Atypical Ductal Hyperplasia and am not sure what to do with the diagnosis. They are recommending a lumpectomy to remove more tissue, but can't guarantee that they will get all the atypical cells. My sister also has ADH, she is on Estrogen Blocker which makes her feel horrible everyday. The surgeon is saying if I opt not to have the lumpectomy, I should at least take an Estrogen Blocker. I am almost 65, so I am not sure if I should just take a wait and watch approach. Any advice? They say I have a 15 to 20 percent chance of developing breast cancer within 25 years, but I also have 80% chance I won't. What would you guys do?