摘要Hydatid disease is a parasitic infestation by a tapeworm of the genus echinococcus.Spinal hydatidosis occurs in 1％ of all cases with hydatidosis and is most commonly located in the dorsal spine.1 It is a rare cause of neurological signs and symptoms.Spinal hydatid disease should be considered in the differential diagnosis of spinal cord compression syndrome in endemic areas.There are no characteristic signs or symptoms.Misdiagnosis is easily to be made preoperatively.Most diagnosis are made intraoperatively,which increases the risk of future recurrences.Here we reported a patient with slowly progressive weakness of lower limbs and aconuresis for 2 months due to L5-S1 spinal intradural hydatidosis compressing the cauda equine and the origin of the left L5-S 1 nerve root.