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Plexiform lesion from a patient with PPH. A: The multichanneled, cellular lesions stain positive for the FVIII-r.ag endothelial cell marker (arrowheads). B: Same lesion as A, immunostained for the VEGF receptor KDR. All of the endothelial cells stain positive for this endothelial cell-specific marker (arrowheads).
