Echinococcosis is an anthropozonosis that occurs in underprivileged areas near sheep and dog farms. Vertebral hydatidosis is rare but dramatic, with a poor prognosis, in spite of an essentially surgical treatment, the recurrences are very frequent and aggravates the prognosis. We report three cases of vertebromedullary hydatidosis involving a 51-year-old woman and two men aged 25 and 48 with an average age of 41 years. The assessment includes standard radiographs, CT and MRI, hydatid serology, abdominal ultrasound for other locations. The clinical picture is dominated by a syndrome of spinal cord compression: parapaesthesia, paraplegia and sphincter disorders, back pain or cervicalgia depending on the location. The seat is dorsal for two cases (D1-D2 and D3-D7) and cervico-dorsal for one case (C7-D3) The MRI is the exam of choice. Treatment is Surgical consists of a cystic vesicle evacuation with wide resection of infiltrated tissue associated with the antiparasitic medical treatment (albendazole) .The diagnosis of hydatidosis was confirmed on histopathological examination. Recidivism frequents two of the three cases. The medullary involvement is due to the development of cysts inside the canal or para vertebral. To think of vertebral hydatidosis in front of a medullary compression table in an endemic zone, Algeria is one of them. Imaging makes it possible to affirm the diagnosis, to assess the lesions and to follow the evolution. Radical surgery followed by medical treatment with albendazole represents the best therapeutic strategy however the frequency of recurrences darken the prognosis.