We report on a case of a 14-year-old boy with a giant serpentine aneurysm of the left internal carotid artery cavernous segment with symptoms of acute mass-effect cranial nerve dysfunction. After a balloon occlusion test of the collateral circulation, the patient underwent parent artery occlusion with platinum Guglielmi detachable coils and fibered coils. An optimal angiographic result and successful clinical outcome were achieved with resolution of IIIrd, IVth and VIth cranial nerve ischemic symptoms. CT angiography and 3D-XRA rotational angiography reconstructions gave sufficient inclusion information on the giant serpentine aneurysm angioarchitechture.
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