Two patients with continuing expansion of an internal iliac artery aneurysm following earlier repair of an aortoiliac aneurysm are described. At the primary operation, inflow to small internal iliac aneurysms had been interrupted by simple proximal ligation only. During follow-up, however, increasing diameter of the by CT-angiography completely thrombosed internal iliac aneurysms required re-operation. The observation of continuing growth of thrombosed internal iliac artery aneurysms following proximal ligation emphasises the danger of persistent collateral circulation and supports the concept of endotension in the absence of endoleak following endovascular AAA repair.
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