Case 50 Answer 2
An ultrasound-guided biopsy yielded ADH. Subsequent lumpectomy showed that this entire lesion was DCIS. No invasive carcinoma was ever found, and nodes were negative.
I would have guessed this was a lobular carcinoma. It was very slow growing, and looked like breast tissue, as lobulars often do. The improtant thing is that you always biopsy developing densities, even if it looks like breast tissue.
To see a case of PASH with a very similar presentation, see related case below.