Elsevier

Journal of Neuroradiology

Volume 33, Issue 5, December 2006, Pages 285-291
Journal of Neuroradiology

Original article
Accuracy of delayed post-contrast flair MR imaging for the diagnosis of leptomeningeal infectious or tumoral diseasesApports de la séquence flair retardée après injection pour le diagnostic des lésions lepto-meningées infectieuses ou tumorales

https://doi.org/10.1016/S0150-9861(06)77286-8Get rights and content

Summary

Aims

To compare unenhanced, gadolinium enhanced, delayed gadolinium enhanced FLAIR images, gadolinium enhanced and delayed gadolinium enhanced T1 images in different types of leptomeningeal diseases, and to determine the most accurate MRI sequence for the diagnosis of leptomeningeal disease.

Material and methods

Ten patients (6 men, 4 women, age: 52,7+/-16,4) clinically suspected of cerebral leptomeningeal infectious or tumoral disease underwent brain MR examination: Axial FLAIR and T1 SE images were acquired before, immediately after administration of gadobenate dimeglumine (0.1mmol per kilogram of body weight) (early enhancement), and 20 minutes after injection of contrast media (delayed enhancement). Images were analysed to determine the more appropriate technique for the diagnosis of leptomeningeal disease.

Results

Early enhanced FLAIR and delayed enhanced T1 were always more or equally accurate for the diagnosis of leptomeningeal diasease, as compared to, respectively, unenhanced FLAIR and early enhanced T1 images.

Delayed enhanced FLAIR was always more accurate for the diagnosis of leptomeningeal disease as compared to early enhanced FLAIR images. Delayed enhanced FLAIR was in most of the cases more accurate for the diagnosis of leptomeningeal disease as compared to delayed enhanced T1 images.

Conclusion

Delayed enhanced FLAIR MR sequence seems to improve the diagnosis of leptomeningeal infectious or tumoral diseases as compared to other MR sequences.

Résumé

Objectifs

comparer les séquences FLAIR sans injection, avec injection, retardées après injection, et les séquences T1 injectées et T1 retardées après injection afin de déterminer quelle est la séquence la plus appropriée pour le diagnostic des lésions lepto-méningées.

Moyens

10 patients (6 hommes, 4 femmes, âge : 52,7 +/- 16,4 ans) suspects d’atteinte leptoméningée (carcinomatose leptoméningée ou méningites infectieuses) ont bénéficié d’une IRM cérébrale avec acquisition d’une séquence axiale T1 SE et d’une séquence axiale FLAIR, répétées immédiatement après injection de gadobenate dimeglumine (0,1 mmol/Kg) et répétées 20 minutes après injection. Les images ont été analysées afin de déterminer quelle séquence apporte le plus d’information pour le diagnostic d’atteinte leptoméningée.

Résultats

les séquences FLAIR injectées précoces et tardives apportaient au moins autant d’information diagnostiques que les séquences FLAIR sans injection et les séquences T1 injectées précoces. Les séquences FLAIR retardées apportaient toujours plus d’informations diagnostiques que les séquences FLAIR injectées précoces et généralement plus d’informations diagnostiques que les séquences T1 injectées tardives.

Conclusion

la séquence FLAIR acquise 20 minute après injection retrouve des lésions sous arachnoïdiennes plus étendues et plus marquées que le T1SE ou les séquences réalisées précocement après injection et semble améliorer le diagnostic radiologique des atteintes leptoméningées.

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There are more references available in the full text version of this article.

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