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Figure 1 Axial computed tomography angiography image at the level of the main pulmonary artery bifurcation shows dilation of the main pulmonary arteries and an eccentric 23-mm mural thrombus along the posterior wall of the right pulmonary artery. The thrombus is composed of multiple layers of thrombus with embedded linear calcifications suggesting repeated events during formation. Calcifications are also seen along the anterior free wall of the right pulmonary artery and its main branches (long arrows) and in the left interlobar artery (short arrow). Ao = ascending aorta; MPA = main pulmonary artery.