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Rejection of a VCA treated with dual costimulation blockade.
A. Macroscopic appearance of BAT4 on POD 21. A petechial rash is newly present, however no significant hair loss is noted from baseline.
B. Skin biopsy from image (A) with H&E staining shown (5× magnification). Significant perivascular infiltration is noted (arrows) with no epithelial involvement, demonstrating a Banff II.
