[Vertebral hydatid cyst. Apropos of 2 cases].

The hydatid disease is rare in osseous locations, especially in our country (2.2 per cent). It has some particularities: clinical latency, diagnosis difficulties, surgical treatment often unsatisfactory because of the difficulty of total excision. Pain and sometimes deformity are often the only clinical features at the beginning of the disease. But, the evolution is unfavourable as soon as neurological symptoms appear. Multiple recurrences lead to unavoidable paraplegia. The antihelminthic drug (mebendazole) is disappointing in osseous location. Surgery is the only hope but the excision must be carcinologic. Spinal instrumentation can be improved by the use of acrylic cement whereas osseous grafts can be invaded by hydatidosis extension or recurrence. At present, the prognosis is still poor with constant apparition of cord compression. The authors report two cases of patients with osseous hydatidosis of the spine which illustrate these difficulties.