Hello Terri,
I was diagnosed with Stage 1 but grade 3 breast cancer with HER-2 factor positive. I also had similar procedure done, it is called sentinel node biopsy to trace whether the cancer has spread in the nearest lymphnodes. My diagnosis came out to be initially negative and only two lymphnodes were removed even though they were not infected. However, later on in another ultra sound a third node was discovered (close to the ones removed) with cancer cells in it. Somehow it was not detected with sentinel node biopsy. I was told it was an exceptional situation.
The procedure of sentinel node biopsy is done on the same day of surgery. It took about an hour and a half.
I am now undergoing chemo and waiting to have another surgery after my last (6of6) chemo next week, to be followed by radiation.
Best wishes for your sister. Just know that so many sisters are out there like yours. Keep the spirit up.
God bless us all!
Rina