[Lumbar arachno-epiduritis. Study of 20 cases].

The authors report twenty cases of lumbar arachnitis, from the clinical, biological, and neuroradiological points of view; a discussion is developed in connexion with various etiological factors centred, on the one hand, on the responsibility of the contrast media used in neuro-radiology and, on the other hand, on that of the act of surgery, a factor that was encountered in half of the cases reported. The possibilities of therapy are also discussed.