Figure 2. (a) Initial pulmonary CT angiography (CTA) in the early arterial phase showing pulmonary arterial hypertension with a main pulmonary artery diameter exceeding the ascending aortic width and left pulmonary artery thrombosis with "smooth-margined" proximal total occlusion at its origin. Note right hilar subcarinal and paratracheal lymphadenopathy and the left lower lobe-consolidating mass (*), which was initially interpreted as pulmonary infarction. (b) The late subsequent late arterial CTA 1 week later shows bright tumour enhancement within the pulmonary mass (arrowheads). Axial CT section below the carina displays the main tumour portion within the left lower pulmonary lobe (arrowheads). The patient had new small bilateral pleural effusions.