Ductal atypia/Intraductal microcalcifications

Hi. I am 35. I went to a cancer doctor to have a lump on my left breast checked out. It conveniently disappeared the day of the appointment (I'm guessing it was a cyst).

The doctor examined both breasts and told me I have very dense breasts. She then ordered a 3D Mammogram and Ultrasound.

I went a few days later. They took me to the mammogram machine 4 times and wound up calling the doctor in during the ultrasound. They focused on my right breast.

I was told they found distorted tissue and calcifications and needed a Mammogram assisted biopsy.

I received the results today. Not cancer, but there are areas she's concerned are precancerous. She wants to operate to remove the abnormalities.

The results are confusing me and, of course, I didn't ask many questions as it didn't hit me until later.

The final diagnosis states:

-Ductal Atypia including: flat epithelial atypia, atypical apocrine metaplasia. In addition there is focal sclerotic portion of intraductal papilloma type changes (cannot exclude atypia) as well as dilated ducts/duct ectasia some with columnar cell changes and scattered chronic inflammation.

-Intraductal microcalcifications indentified

Can anyone explain all of that for a beginner?