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Figure 2 (A) Axial computed tomography angiography image at the level of the main pulmonary arteries demonstrates severe dilation, with the main pulmonary artery measuring 71 mm. There is an associated eccentric irregular thrombus in the left main pulmonary artery (short arrows). A tiny focus of calcification is noted in the posterior wall of the right pulmonary artery (long arrow). (B) Axial image at the level of lung bases showing extension of the thrombus into the segmental basal arteries of the left lower lobe (short arrows).