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Pulmonary Arterial Hypertension: histological features Screening and diagnosis Chest radiograph in PAH Echocardiography in PAH Right heart catheterization Right heart catheterization Organ involvement in Systemic sclerosis The two major subsets of SSc The nature of the vascular dysfunction in SSc Vascular changes in PAH Pathology of PAH Structure of arteries Structure of capillaries Structure of veins Thrombotic pulmonary arteriopathy Vasoconstriction of pulmonary arteries