Figure 4.

(A) Endoarterial biopsy samples obtained at baseline from presurgical, normal pulmonary artery. Hematoxylin and eosin stain; magnification, ×40. (B) Postsurgical left pulmonary artery with systemic pulmonary hypertension, showing thickened neointima (arrows) and disorganized medial layer. Hematoxylin and eosin stain; magnification, ×40. (C) Specimen of the left (hypertensive) lung at time of necropsy, showing vascular occlusive and plexiform-like lesions. Hematoxylin and eosin stain; magnification, ×10.