Core “A” and “B” were taken from the same patient during the same biopsy procedure. The red blood cells within the tubules in core “B” represent a biopsy artifact sometimes seen when multiple passes are made during the same biopsy procedure. One confirmatory clue is the presence of red blood cells surrounding the periphery of core “B” – these are not present in core “A” which was likely the first core taken during the biopsy.