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Fig. 1A —60-year-old man with severe dyspnea (New York Heart Association class 4). Contrast-enhanced thin-slab maximum-intensity-projection CT image oriented in long axis of left pulmonary artery shows obstructive form of chronic thromboembolic pulmonary hypertension. Presence of proximal endarterectomy plane is evident in left pulmonary artery, which is completely obstructed (arrows) in proximal aspect. Clot thickness was 22 mm.