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The axial slices of pons and medulla (A) and the whole mount sections of the pons from the framed slice (B, HE) do not show pathological changes of note; the pons shows increased widespread cellularity secondary to infiltration of atypical cells (C, HE; framed areas in the whole mount); tumor cells often express Ki‐67 indicating proliferation; a mitosis is present in this field (arrow) (D, immunoperoxidase). Scale bars: 1 cm (A), 500 μm (B), 100 μm (C, D).
