A different problem in each breast..

I had biopsies yesterday in both left and right breast. 
the left side has micro calcification, and the right sight has a high density mass.

So is it common for each breast to have different conditions at the same time? And if they are both positive, which would get treated first, as I am guessing they would not both necessarily require the same treatment, and different treatment may contradict the other .

Results due in 7 days. Thanks