Computed tomography coronary angiogram from a 43-year-old female patient with pulmonary arterial hypertension, showing compression of the left coronary artery main stem by a large pulmonary artery (PA) aneurysm. Computed tomography coronary angiogram from a 43-year-old female patient with pulmonary arterial hypertension, showing compression of the left coronary artery main stem by a large pulmonary artery (PA) aneurysm. LCA: left coronary artery; AOV: aortic valve. Daniel Dumitrescu et al. Eur Respir Rev 2017;26:170039 ©2017 by European Respiratory Society