Treatment of Cranial Internal Carotid Artery Aneurysm With Willis Covered Stent and Coil Embolization

2014-07-23 21:11:25 | BioPortfolio


Intracranial aneurysm treatment with coil embolization is associated with relatively low complete occlusion and high recanalization rates. The investigators evaluate whether Willis covered stent implantation yields angiographic and clinical results superior to those with coil embolization.


Endovascular treatment of intracranial aneurysms with detachable coils has been widely used since the introduction of GDCs in 1991 and has been proven to be effective in preventing rebleeding after aneurysmal rupture. The clinical and angiographic results of endovascular coil occlusion of intracranial aneurysms are positive, with an initial and final overall complete occlusion rate of 35.9%-76.8% and 38.3%- 87.8%. In the mid- and long-term, however, aneurysm recanalization may occur in as many as one-third of cases.

The natural history of aneurysm recurrence after coil treatment is often benign, but bleeding from incompletely coiled aneurysms is a well-documented threat, moreover, the degree of aneurysm occlusion after treatment was strongly associated with risk of rerupture. Even if 100% occlusion of the aneurysms after the initial treatment was obtained on immediate postembolization angiography, there was still a relatively high recanalization rate (26.4%) on long-term follow-up angiography. In a recent study, we have confirmed that there was still aneurysm perfusion of the aneurysm sac in a complete occluded aneurysm no matter on initial or follow-up rotate digital angiography. In addition, some authors have demonstrated that endothelialization of the aneurysm orifice following placement of GDCs can occur; however, it appears to be the exception rather than the rule.

To overcome these disadvantages, the Willis covered stent, specially designed for intracranial vasculature, has been developed by our institution and the MicroPort Medical Company (Micro-Port, Shanghai, China). Our preliminary results demonstrated good flexibility and efficacy of the Willis covered stent in the treatment of cranial internal carotid artery aneurysms (CICA) in patients without an extremely tortuous ICA (Radiology 2009; 253:470-7), and also the covered stents have been proved to be more effective than re-coiling with regard to complete occlusion of recurrent aneurysms (J Neurol Neurosurg Psychiatry 2009;16:[Epub ahead of print]). Since 2005, we have performed a nonrandomized prospective trial of endovascular treatment CICA aneurysms with a covered stenting or coil embolization. So, we evaluate whether implantation of a primary Willis covered stent yielded angiographic and clinical results that superior to those with the currently recommended approach of coil embolization.

Study Design

Allocation: Non-Randomized, Control: Uncontrolled, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment


Intracranial Aneurysms


Covered stent, Coil


The Sixth Affiliated People's Hospital, Shanghai Jiao Tong University




Shanghai Jiao Tong University School of Medicine

Results (where available)

View Results


Published on BioPortfolio: 2014-07-23T21:11:25-0400

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Medical and Biotech [MESH] Definitions

Abnormal outpouching in the wall of intracranial blood vessels. Most common are the saccular (berry) aneurysms located at branch points in CIRCLE OF WILLIS at the base of the brain. Vessel rupture results in SUBARACHNOID HEMORRHAGE or INTRACRANIAL HEMORRHAGES. Giant aneurysms (>2.5 cm in diameter) may compress adjacent structures, including the OCULOMOTOR NERVE. (From Adams et al., Principles of Neurology, 6th ed, p841)

A localized bulging or dilatation in the muscle wall of a heart (MYOCARDIUM), usually in the LEFT VENTRICLE. Blood-filled aneurysms are dangerous because they may burst. Fibrous aneurysms interfere with the heart function through the loss of contractility. True aneurysm is bound by the vessel wall or cardiac wall. False aneurysms are HEMATOMA caused by myocardial rupture.

Aneurysm of the MICROVASCULATURE. Charcot–Bouchard aneurysms are aneurysms of the brain vasculature which is a common cause of CEREBRAL HEMORRHAGE. Retinal microaneurysm is an early diagnostic sign of DIABETIC RETINOPATHY.

A well-circumscribed mass composed of tuberculous granulation tissue that may occur in the cerebral hemispheres, cerebellum, brain stem, or perimeningeal spaces. Multiple lesions are quite common. Management of intracranial manifestations vary with lesion site. Intracranial tuberculomas may be associated with SEIZURES, focal neurologic deficits, and INTRACRANIAL HYPERTENSION. Spinal cord tuberculomas may be associated with localized or radicular pain, weakness, sensory loss, and incontinence. Tuberculomas may arise as OPPORTUNISTIC INFECTIONS, but also occur in immunocompetent individuals.

Embolism or thrombosis involving blood vessels which supply intracranial structures. Emboli may originate from extracranial or intracranial sources. Thrombosis may occur in arterial or venous structures.

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