[Radiographic diagnosis of sacral meningeal cysts].

The aim of this study was to establish the incidence and morphological variety of sacral meningeal cysts as well as proposing diagnostic algorithm in dubious cases. A series of 1800 radicular-radiographies has been retrospectively analysed and 17 cases of a terminal cistern enlargement have been found (0.94%). Three types of cysts have emerged depending on its communication with the cerebral fluid reservoir. Two cases have illustrated the suggestion of performing CT scan instead of epidural administration of the contrast agent in case of suspected pathological mass within sacral spinal canal.