Ventilation perfusion scanning findings of chronic thromboembolic pulmonary hypertension

Representative ventilation/perfusion (V/Q) scan in a patient with chronic thromboembolic pulmonary hypertension. Ventilation scan is normal (panels A-D). Multiple mismatched, segmental perfusion defects are present involving the anterior basal segment of the right lower lobe and the entirety of the left lower lobe and lingula (arrows).