Chronic thromboembolic pulmonary hypertension (CTEPH) is a rare but life-threatening condition resulting from unresolved thromboembolic obstructions. Pulmonary endarterectomy surgery is currently the standard of treatment, as it is potentially curative; however, not all cases are amenable to surgical intervention due to distal distribution of the organized thromboembolic material or the presenc...

Chronic obstruction of pulmonary arteries can be due to a variety of disease processes, including chronic thromboembolic disease, fibrosing mediastinitis, or neoplasia. Large vessel arteritis is another unusual cause of pulmonary artery obstruction and can be difficult to distinguish from the above-listed etiologies. We present four patients referred to our institution with the provisional diag...