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Focal extraprostatic extension. a T2W MRI with a heavily DW image of the prostate overlaid (in colour). b T2W close-up of the prostate. c Corresponding whole-mount section with a 1 mm2 grid overlay. d Close-up microscopic views; 40× magnification shows tumour islet (black arrow) representing focal extraprostatic extension of less than 1 mm radial in length, which was unrecognised and not clearly demonstrated (white arrow, b) at MRI
