Paralysie bilatérale du nerf moteur oculaire commun secondaire à une poussée de sclérose en plaques

Introduction. We report a case of bilateral third cranial nerve palsy in a patient with a secondary progressive multiple sclerosis. Observation. MRI revealed a large hyperintense lesion in T2-weighted images in the mesencephalic area. The clinical and radiological outcome was good after intravenous methylprednisolone. The oculomotor signs were probably caused by this mesencephalic lesion. Conclusion. This case of bilateral third cranial nerve palsy is, to our knowledge, the first one occurring in a patient with multiple sclerosis.