What can change from preliminary to final patho report?

I had a stereotactic biopsy and a U/S guided biopsy and my pathology report stated DCIS, solid and cribriform types, partially involving papillary lesion.  The report did not mention the grade, so I'll have to ask my breast surgeon when I see her next week.  In the meantime, if anyone has had similar report, would be interested to hear from you.  My breast surgeon has said my stage is considered "0" at this time, but this is only a preliminary staging.  I plan to have a dbl mastectomy, although the problem seems to be only in my left breast at this time.   I understand final staging can't really be done until the breast tissues are removed and tested and a pathology report provided post mastectomy.  Still waiting for results of my BRCA test, as breast cancer seems to be genetic.  Several family members have had it.  Mother (age 76), daughter (age 34), maternal aunt (age 34), and at least two other maternal aunts (ages unknown), have had breast cancer.

Yes songlady and bethq, final path report determines exactly what you are up against. It is upgraded sometimes and also downgraded sometimes (which happened to me) as initially I was told lesion was about 2cm and it turned out to be 5mm only. I had two lumpies because although I had clean margins the first time, one was less than 1mm which is not acceptable to my rads onc. So, back I went to have it shaved. Now my margins are all above a cm so am happy. If you have mx, you won't have to worry about that though. Wishing you both the best possible outcome!

On biopsy, my DCIS was intermediate (stage 2) and clean margins.  Only thing that changed was it was upgraded to stage 3 with clean margins on the final path.  So just a little bit more tissue was removed, but nothing significant.  Had 4 weeks of rads and that was it for treatment.  Like MellaBella said, focus on the 80% of us that didn't have a substantial change. 

Lilyluv, I think you are mixing up grade and stage. Pure DCIS is always stage 0. The grade refers to how mutated/aggressive the cells are. Your stats in your signature look correct.