Figure 1.

Generic CTPA signs suggesting the presence of PAH. (A) Axial image showing substantial enlargement of the MPA measured at its bifurcation (arrows); (B) axial image showing enlargement of the right heart chambers (RA >3.5 cm) with right ventricular hypertrophy (wall thickness >4 mm) which in this case is secondary to a large ostium secundum atrial septal defect (curved arrow). RA, right atrium; RV, right ventricle; LV, left ventricle; CTPA, computed tomography pulmonary angiography; PAH, pulmonary arterial hypertension.