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Spinal dermoid cysts are relatively infrequent tumors generally associated with a benign course. Here we describe three cases and analyzed the 109 cases of lumbar dermal cysts described in the literature in the last 20 years. We report a pediatric patient with a dermoid cyst posterior to a lumbar surgery for myelomeningocele repair with bad evolution; and two adult patients with the affection of the motor and autonomic function with good surgical outcomes. In approximately half of the reviewed cases, it was reported at least one complication. In fact, two cases had a fatal outcome. We discuss relevant characteristics of these lesions and those aspects probably associated with complications and bad outcomes.