[On the clinical picture and therapy of arachnitis optico-chiasmatica (author's transl)].

From 20 cases of arachnitis optico-chiasmatica (a. o.) the symptoms of this relatively rare but pathologico-anatomically proved disuse of the brain base involving the optic nerves are described. In this description newer methods of investigation are mentioned which allow a differentiation of the clinical picture of o.a. from that of tumors of the middle cranial fossa. A single case is described in especial detail because a remarkable corneal cloudiness occured in it. The anatomical connection between this corneal cloudiness and vegetative nerve fibers in the region of the Gasserian ganglion is mentioned in honour of the theory of Speransky on nerve-directed tissue changes.