Figure 4.

Histopathological findings of pulmonary tumor thrombotic microangiopathy in case 2. (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) Neither prominent fibrocellular intimal proliferation nor carcinoma cells were present in the pulmonary artery over 300 μm in diameter (HE double stain and EVG stain, × 40).