A case of late onset multiple sclerosis mimicking glioblastoma and displaying intraoperative 5-aminolevulinic acid fluorescence NORBERT MANZO1, ULF NESTLER1, NEUROSURGERY, Martinique Various case reports and case series describe the resemblance of multiple sclerosis lesions to cerebral glioma on MRI. Multiple sclerosis accounts for about 1% of histological diagnosis in biopsies or surgical specimens resected for suspicion of brain tumor. Only few information is available about the interaction between sclerotic plaques and the fluorescence guided resection agent 5-aminolevulinic acid, which is currently used more and more often to allow for complete resection of malignant brain tumors. We report the case of a 57-year-old male patient who underwent neurosurgical intervention for an intracerebral mass lesion with the features of a malignant brain tumor on preoperative MRI. During intervention, the lesion showed strong 5-Ala fluorescence and intraoperative histological diagnosis on frozen material was malignant astrocytoma. After additional examinations on the paraffin embedded specimens definitive diagnosis revealed multiple sclerosis. Conclusion: We hypothesize that the inflammatory lymphatic cells engaged in the demyelinating process are susceptible to protoporphyrin IX accumulation induced by 5-aminolevulinic acid. In this way a fluorescence signal, very similar to the signal of malignant tumor cells, becomes detectable.
Traduisant, sur un système nerveux entièrement normal, un excès d’influx nociceptif
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Douleurs Neuropathiques Bennett, 1994
«Douleurs résultant d’unemtncnitnoenfoanormaldu système nerveux, consécutif à des lésions périphériques ou centrales ayant porté atteinte à l’intégrité anatomique des voies ou des centres impliqués dans la transmission et le traitement des activités nerveuses sensitives issues de la périphérie»
Etat Basal : Absence de Douleur Douleur = 0Tact
Petites Fibres Nociceptives C, A≅
S stème Excitateur< InhibiteurS stème
Grosses Fibres Aa, Ab
Douleur par excès de nociception DouleurTact
Petites Fibres Nociceptives C, A≅
Système Excitateur>Système Inhibiteur
rosses Fibres , Ab
Douleur Neuropathique
Douleur
Lésion Nerveuse
Tact
Grosses Fibres Aa, Ab
Petites Fibres Nociceptives C, A≅ Système Excitateur>Système Inhibiteur