Fig. 8
From: Looking beyond the thrombus: essentials of pulmonary artery imaging on CT
Contrast-enhanced axial CT image (a) in a 16-year-old patient with progressive dyspnea and absent left upper extremity pulse shows a focus of smooth narrowing and aneurysmal dilatation of the left main pulmonary artery (arrow). Late venous phase axial MR image from a 3D GRE acquisition (b) shows delayed enhancement of an aneurysmal left pulmonary artery branch (arrow). Also note the wall enhancement of descending thoracic aorta (arrowhead) consistent with vasculitis. These findings are suggestive of Takayasu arteritis