A single focus of probable multiple sclerosis in the cervical spinal cord mimicking a tumour.

A case of probable multiple sclerosis (MS) in the cervical cord without brain involvement, mimicking a tumour is reported. The patient had a progressive left Brown-Séquard syndrome. The diagnosis was suggested by MRI. In spite of intensive corticotherapy, the neurological status worsened, in parallel with the radiological findings. Biopsy excluded an intramedullary tumour and supported the diagnosis of MS.