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Figure 2 Pulmonary occlusive venopathy. (A) Septal veins with nearly occluded lumens by fibrous intimal thickening (asterisk), marked lymphatic dilation (arrow), and congested alveolar capillaries. Verhoeff-van Gieson staining, x50. (B) Obstructive fibrous intimal thickening and recanalization channels in a septal vein, x200. Pulmonary microvasculopathy. (C) Focal thickening of alveolar septa by proliferated capillaries, HE,x20. (D) Nodular capillary proliferation, hemosiderin-laden alveolar macrophages and type II pneumocytes (arrows), HE, x300.