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Histopathological findings of pulmonary tumor thrombotic microangiopathy in case 1. (A and B) Fibrocellular intimal proliferation occludes the lumen of the pulmonary artery under 100 μm in diameter (Hematoxylin-eosin (HE) double stain and elastica van Gieson (EVG) stain, × 400). (C and D) Fibrocellular intimal proliferation associated with carcinoma cells proliferation occludes the lumen of the pulmonary artery over 300 μm in diameter (HE double stain and EVG stain, × 40).
