Figure 7b. Microscopic features of PVOD. (a) Medium-power photomicrograph (original magnification, x20; H-E stain) of a parenchymal vein demonstrates narrowing of the lumen by loose, edematous intimal fibrous tissue that has been recanalized to form three channels. (b) Medium-power photomicrograph (original magnification, x10; H-E stain) demonstrates a fibrotic interlobular septum containing a vein whose lumen is occluded by dense, collagen-rich fibrous tissue (arrowhead).