Note technique
Localisation en IRM des anévrismes carotidiens paraclinoïdiensMRI localization of paraclinoid carotid aneurysms

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Résumé

But

le plan de l’anneau dural distal (PADD) sépare les portions intra- et supracaverneuses de l’artère carotide interne paraclinoïdienne. Le but de ce protocole d’IRM est d’évaluer la position de ce plan pour la localisation des anévrismes paraclinoïdiens.

Méthode

le protocole est basé sur une séquence T2 dans deux plans orthogonaux (plans diaphragmatique et carotidien) et sur deux droites de corrélation dans chaque plan. Ces droites passent par des points anatomoradiologiques de référence corrélés aux limites médiolatérales et antéropostérieures du PADD. Nous utilisons l’angle d’intersection de ces droites comme la limite radiologique inférieure du PADD.

Résultats

un anévrisme situé au-dessus de cet angle est supracaverneux ; un anévrisme situé en dessous de cet angle est intracaverneux ; un anévrisme situé à cheval sur cet angle est transitionnel.

Conclusion

ce protocole d’IRM permettra de mieux situer de part et d’autre du toit de la loge caverneuse les anévrismes paraclinoïdiens difficiles à localiser en angiographie.

Summary

Aim

The distal dural ring plane (DDRP) separates the intracavernous from the supracavernous paraclinoid internal carotid artery. The purpose of this MRI protocol is to evaluate the position of this plane for the characterization of paraclinoid aneurysms.

Method

The protocol uses a T2 weighted sequence in two orthogonal planes (diaphragmatic and carotid planes) and two correlation lines in each plane. These lines pass through anatomo-radiological reference points correlated with the medio-lateral and antero-posterior margins of the DDRP. We use the intersection angle of these lines as the inferior radiological limit of the DDRP curve.

Results

An aneurysm located above this angle is supracavernous; an aneurysm located below this angle is intracavernous; an aneurysm crossing this angle is transitional.

Conclusion

In difficult cases, this MRI protocol could help better characterize the exact localization of paraclinoid aneurysms on both sides of the cavernous sinus roof.

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    A number of comparative studies have shown that multi-detector row CTA has high sensitivity and specificity for the detection of intracranial aneurysms in patients with acute SAH [4,8,9,15,17,21,23]. CTA has also been used as unique pre-therapeutic tool in the preparatory phase of aneurysm clipping [1,5,10,16,20,21]. The purpose of this study was to determine the accuracy of multi-detector row computed tomography angiography (CTA) for triage in patients with acutely ruptured intracranial aneurysms, and to assess, how therapeutic decisions based on this method compared with DSA.

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