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Department of Neurosurgery Gülhane Military Medical Faculty Ankara Türkiye The human tail has long been an object of curiosity. Sporadic cases have been reported. We present a case of a tail like structure in an adult associated with an intradural dermoid tumour at Ll-L2. The dermoid tumour attached to the dorsal surface of the conus medullaris and cauda equina was exased and the filum terminale extending to the sacral appendage was dissected. These findings support the hypothesis that neuroectodermal appendages may be a superficial extension of adermal sinus tract. Keywords : Dermal sinus tract, Human tail, Neuroectodermal appendage