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Comparison of CT angiography with conventional arterial angiography in aortoiliac occlusive disease

Department for Diagnostic Imaging, North Staffordshire Hospital NHS Trust, Newcastle Road, Stoke on Trent ST4 6QG, UK

View larger version (100K): [in a new window]   Figure 1. (a) CT angiography demonstrates complete occlusion of the left common iliac, the external iliac and the common femoral arteries as well as an aneurysm of the distal abdominal aorta (open arrow). (b) The aortic lumen appears normal on conventional angiography and calcification of the aneurysm is not visible. Early venous filling mimicks external iliac artery patency.

View larger version (95K): [in a new window]   Figure 2. Concordance of findings: stenosis of the origin of the right external iliac artery (arrow) on(a) conventional angiography and (b,c) CT angiography.

View larger version (71K): [in a new window]   Figure 3. Short eccentric stenosis (arrow) seen in the distal abdominal aorta on (a) conventional angiography lateral view and (b) coronal multiplanar reconstruction of a CT angiography. (c) The sagittal multiplanar reconstruction demonstrates a short but tight stenosis (arrow). These images demonstrate the value of reconstructing in two planes.

View larger version (86K): [in a new window]   Figure 4. Concentric stenosis at the origin of the left common iliac artery (arrow) is well demonstrated on conventional angiography and the two multiplanar reconstructions of CT angiography (a,b). A further minor stenosis of the left external iliac artery (open arrow) was better appreciated on the coronal reconstruction (b).

View larger version (101K): [in a new window]   Figure 5. Short stenosis at the origin of the left common iliac artery (arrow) is well seen on conventional angiography (a) but not confidently demonstrated on CT angiography (b). This case highlights the poor z-axis resolution of CT angiography.