1. Introduction et pertinence de la neuroimagerie
Le Résonance magnétique cérébrale (IRM) constitue l'examen complémentaire de première intention après l'anamnèse et l'examen neurologique détaillé chez tout enfant suspecté Paralysie cérébrale infantile (IPC). On estime que l'IRM révèle des anomalies pathogènes dans plus de 80% des cas, en s'orientant sur le moment temporel et la nature de la noxa cérébrale.
2. Classification SCPE selon les modèles de neuroimagerie
Le réseau de Surveillance de la paralysie cérébrale en Europe (SCPE) Stratifie les résultats de la neuroimagerie en 5 catégories essentielles :
- Lésions prédominantes de la substance blanche (environ 50 %) : Leucomalacie périventriculaire, généralement secondaire à des événements ischémiques ou infectieux périnatals chez les prématurés.
- Lésions de la matière grise corticale et des noyaux gris centraux (environ 20 %) : Lésions hypoxiques-ischémiques à terme ou encéphalopathies périnatales aiguës.
- Malformations du développement cérébral (environ 11%) : Troubles de la migration, polymicrogyrie, schicencéphalie ou lissencéphalie.
- Résonance magnétique normale (environ 11 %) : Absence de dommages structurels acquis évidents.
- Divers/Non spécifique : Autres altérations anatomiques non catégorisables dans les groupes précédents.
3. Quand indiquer les études génétiques en ICP ?
Les performances diagnostiques de l’étude génétique (puces chromosomiques, panels de séquençage massif ou exome entier) varient considérablement en fonction du modèle de neuroimagerie :
- Indication prioritaire et suspicion monogénique élevée : Chez les patients avec IRM normale ou avec malformations du développement cérébral, la probabilité d'une étiologie monogénique sous-jacente est très élevée. Dans ces cas, une étude génétique est formellement indiquée.
- Vulnérabilité génétique dans les blessures acquises : Dans les cas de lésions acquises de la substance blanche ou grise sans antécédents clairs d'asphyxie ou de facteurs de risque périnatals, une prédisposition génétique augmentant la vulnérabilité cellulaire aux noxas minimes doit être envisagée.
4. Recommandations pratiques pour la consultation
Chez un patient présentant des symptômes de paralysie cérébrale sans antécédents périnatals clairs ou avec une neuroimagerie atypique ou normale, il convient d'éviter de supposer une cause de blessure non documentée et de démarrer tôt l'algorithme de diagnostic génétique.
Bibliographie et références
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Horber V, Grasshoff U, Sellier E, Arnaud C, Krägeloh-Mann I, Himmelmann K. Le rôle de la neuroimagerie et de l'analyse génétique dans le diagnostic des enfants atteints de paralysie cérébrale. Front Neurol [Internet]. 9 février 2021 [cité le 4 janvier 2026] ;11. Disponible à partir de : https://www.frontiersin.org/journals/neurology/articles/10.3389/fneur.2020.628075/full