A 72-year-old ex-smoker with hypertension and hypercholesterolaemia presents with a pulsatile abdominal mass. B-mode ultrasound shows a focal fusiform dilatation of the infrarenal aorta. The structure marked **A** in the diagram measures 5.5 cm outer-wall to outer-wall in true cross-section. Based on this measurement and the clinical presentation, what is the most appropriate next step in management?
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