Infrarenal abdominal aortic aneurysm on MRI and CT scan

The T1 weighted MRI sequence (A) shows a 4 cm infrarenal AAA. The same aneurysm is also shown on a contrast enhanced CT scan (B). CT is highly sensitive for even small amounts of calcium (arrow), whereas the lack of sensitivity of MRI for calcification limits accurate measurement and characterization of changes in the aortic wall.