Normal aortoiliac diameters by CT.

In spite of the vital role CT plays in the evaluation of vascular disease, no standard CT derived dimensions for the abdominal aorta, iliac, and femoral arteries have been established. A retrospective study of the CT scans of 260 patients was performed with patients separated by sex and age. Aortic diameter was measured at predetermined suprarenal, renal, and infrarenal locations and single measurements of the iliac and femoral arteries were made bilaterally. The vessel diameter was observed to gradually increase with age in both sexes. Men were found to have larger diameter vessels than age matched women. This pattern was noted at all levels measured. The normal range of vascular dimensions determined is presented.