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Figure 1 Lung Biopsy Sections Showing Histological Changes in Intra-Acinar Pulmonary Arteries in Reversible PHT and Irreversible PHT

(A) Increased wall thickness (arrow) and thin and regular intimal layer (arrowhead). (B) Increased wall thickness (arrow) associated with intimal thickening (arrowhead) in irreversible pulmonary hypertension (PHT).