Fig. 1: Gleason pattern 4 and pattern 5 tumor morphology.

a Gleason pattern 4, small invasive cribriform structures, 15×. b Gleason pattern 4, large invasive cribriform structures, 10×. c Gleason pattern 5, cords, 20×. d Gleason pattern 5, small solid nests with subtle intervening stroma, 20×. e Gleason pattern 5, medium to large sized solid fields, 15×. f Gleason pattern 5, comedonecrosis in a solid field, 15×.