Figure 3

Photomicrographs of index findings showing the pulmonary arteries with or without stenosis. Legend: (A and B) The pulmonary artery of muscular type shows asymmetric intimal thickening with fibro-cellular proliferation, which is eroded and attached with clustered carcinoma cells including fibrin (Hematoxylin and Eosin (H&E) and Elastica van Gieson (EVG) stains, original magnification x 400). (C and D) Carcinoma cells were found in the lumen of the pulmonary artery, whereas neither fibro-cellular proliferation nor fibrin thrombus was found (H&E and EVG stains, original magnification x 400).