Fig. 3

Histologic and immunochemical staining images of pulmonary artery mass. (A) well circumscribed lesion composed of numerous small and medium sized blood vessels; (B) areas of hemorrhage; (C) disorganized proliferation of thin-walled vascular channels; (D) proliferation of larger venous channels; (E) stain for endothelial transcription factor related gene highlighting endothelial cells in vascular proliferation; D) smooth muscle actin staining pericytes along walls of capillaries