Abdominal aortic aneurysm
An elderly gentleman presented with abdominal pain and a pulsatile abdominal mass.
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CT demonstrates an aortic aneurysm, the high attenuation peripherally (axial slices) suggests recent hemorrhage and is a feature of impending rupture.
A nice example of extra-luminal high attenuation in the wall of an aortic aneurysm.
A non-contrast CT should normally be included in the acute assessment of abdominal aortic aneurysm to confirm that the hyperdense crescent is there before you give contrast.