[Congenital spinal intradural and extradural cysts].

Two intradural and two extradural spinal cysts are reported. The authors compare these cases with others reported in the literature. They agree about the dorsal retromedullary site but they disagree about the age and sex. Although the cysts have been opacified only in two cases, the myelographic diagnosis was easy in every case except one. The myelo-CT is'nt necessary for diagnosis but it offers a better visualization of the relation between the lesion and the spinal cord.