That doesn't quite make sense - I can see how an MRI result may come back as 'suspicious' or 'inconclusive' but not a biopsy core. The cells are graded from 1 to 5, with 3 / 4 / 5 all being 'cancer' and 1 / 2 being benign. Have you got a copy of the biopsy report? Does it say that the one core contained PNI perhaps?