Case report of an intradural, extramedullary epidermoid tumor, at the level of T12, in a 9 year old boy, treated surgically. The authors stress the difficulty to diagnose this case, for the clinical picture seemed that of a radiculopaty due to compression by an intervertebral herniated disc. The evo- lution was favorable, with complete recuperation and without sequelae. The authors point out the necessity of defining the designation of these tumors, often confused with dermoid cysts and other congenital tumors.