Multislice CT virtual intravascular endoscopy of aortic dissection: A pictorial essay

Figure 2 Stanford type A dissection with the true lumen smaller than the false lumen. The false lumen (F) has lower computed tomography (CT) attenuation than that in the true lumen (T) due to thrombus formation (A), thus a lower CT threshold (90 HU) was applied to view the false lumen intraluminally (B), while a higher CT attenuation (300 HU) was applied to demonstrate the true lumen. Corresponding virtual intravascular endoscopy (C) shows the involvement of three aortic branches by the dissection, namely left subclavian artery (LSA), left common carotid artery (LCA) and innominate artery when the view is positioned inside the false lumen. Bilateral pleural effusion is present on the 2D axial image.