Figure 16. Banff Lesion Score ah (arteriolar hyalinosis). A, Banff Lesion Score ah1—mild focal arteriolar hyalinosis (arrow). PAS, original magnification x630. B, ah2—Moderate arteriolar hyalinosis (arrow). PAS, original magnification x630. C, Banff Lesion Score ah2—Note in this image there is both linear (short arrow) and nodular hyalinosis (long arrow). For a score of ah2, more than 1 arteriole displaying moderate to severe is required. Jones silver stain, original magnification x630. D, Banff Lesion Score ah3—severe circumferential arteriolar hyalinosis with luminal occlusion. For Banff Lesion Score ah3, hyalinosis of this severity (arrow) must be present in many arterioles. PAS, original magnification x630.