Hydatid disease affecting the bones is a rare condition, its incidence ranging from 0.5-2% of all cases of hydatidosis. The bones most often involved are the vertebrae (44%). A 22-year-old man presented to the hospital with low back pain. A CT scan revealed intracanal and paravertebral cystic lesions at the level of L5-S1 with destruction of the corpus and lamina, and sacral foramen invasion. An operation was performed and histopathological findings confirmed the diagnosis. In countries where hydatidosis is endemic, the possibility of the disease must be borne in mind.