In case people thought there was only one type, the prognosis for some of this variants which can be rare cases, can be bleak in comparison to what most of us face. Good pathology should be able to define which type you have, another reason for possible reviews by experts (Bostwick, Epstein, Oppenheimer etc.)
I have seen a few people who got diagnosed with small cell PCa, it is so sad I won't talk about right now.
Kind of gives you a better perspective cause it shows photo/slides of what pathologists look at, it is an art to define, what, where- like as to perineural invasions, Gleason scoring, percentages found etc.
Interesting to know even a little on this stuff.