Atypical ductal hyperplasia

Mclayne5

When trying to interpret your path report, bear in mind these reports are communications between physicians, they are not written in a manner intended for patients. They assume knowledge previously acquired in the course of medical practice for which Google is not a substitute. The ACR mandated mammogram "patient letter" was an attempt to deliver the salient facts of your breast imaging without sending people to the internet searching terms, but I have found most patients find their content inadequate these days.

"Deeper levels" refers to the evaluation of the processed biopsy material submitted, specifically the position within a tissue block and not a position within the breast.

Microcysts (apocrine microcysts) are benign,

Mucocele-like lesion "(MLL) is a rare mucinous lesion of the breast with highly variable upgrade rates to atypia or malignancy on excision" (reference: https://www.ncbi.nlm.nih.gov/pubmed/23161710)

Assuming you had calcifications targeted on your stereo biopsy and not a suspicious mass, the likelihood of an upgrade to DCIS is more likely than an upgrade straight to IDC. (reference: http://pubs.rsna.org/doi/full/10.1148/radiol.09091...)

Either way, the die is cast and you will have your answer soon after your surgery.