Fig 6. Changes of the inner and outer walls of aneurysms over time. Left, Plot of change in lumen shows that the lumenal wall of the aneurysm can either increase or decrease. The substantial decrease in lumen size for patient 3 is related to a partial thrombosis of the lumen between the 2 first time points. Right, Plot of changes in outer wall over time shows that changes are highly variable between individuals. Outer wall volumes either remain essentially unchanged (±5%) or increase over time.