about 60 y/f, right breast mass 2 cm by imaging, breast core biopsy.

1. Your differential diagnosis?

2. What will you do next?

Please do not just give a diagnosis. Your dx is a guess dx even though your diagnosis may be right.

As pathologists we should learn how to analyse our cases with logic thought.We should have differential dx for all cases in our mind even for the easy cases. We can use available sources (such as IHC, molecular methods, history, consultation) to rule in or rule out the differential dx, then make the final dx. 

Learning the priniciple for diagnosis is much more important than learning a few cases.