Archive for the ‘Aorta Imaging Sign’ Category
Hyperattenuating Crescent Sign
Hyperattenuating Crescent Sign : is a CT sign of acute or impending rupture of abdominal aortic aneurysm.
Finding : A well-defined peripheral crescent of increased attenuation within the thrombus of a large abdominal aortic aneurysm.
This finding is best appreciated on unenhanced CT images. It represents an internal dissection of blood into either the peripheral thrombus or the aneurysm wall, a process that either causes or results from a loss in the ability of the thrombus to protect the aneurysm from rupture. It is one of the earliest and most specific imaging manifestations of the rupture process
Draped aorta sign
Draped aorta sign : An important CT imaging feature that may be seen in a contained rupture of an abdominal aortic aneurysm.
Findings : The posterior wall of the aorta either is not identifiable as distinct from adjacent structures or when it closely follows the contour of adjacent vertebral bodies.
