[Intradural spinal metastasis by visceral cancers. Apropos of 4 cases]

The authors present four new cases of intradural spinal metastasis from visceral neoplasms. The different pathogenic mechanisms (arterial and venous routes, spreading by the way of the perineural lymphatics and the subarachnoid space) are discussed in consideration of the metastatic localization (intramedullary or extramedullary).