Abstract
A case of intraspinal epidermoid tumour following a posterior fossa surgery is described. This tumour developped 7 years after a left cerebellar pilocytic astrocytoma resection. We report a 19-year-old male who presented with a progressive 2 years history of cervical cord compression. Magnetic resonance imaging with gadolinium enhancement showed a 13 mm intradural extramedullary mass at the C5-6 level. Due to the unusual localization of this tumour and the absence of clinical and radiological stigmatas of spinal dysraphism, the preoperative diagnosis on this case was arachnoid cyst. This tumour was successfully operated. Pathologic diagnosis revealed an epidermoid tumour. Pathogenesis of this tumour was discussed (skin fragment migration).