[Tumors of brain middle line. Report on 12 cases (author's transl)].

A study is made of 12 cases with median supratentorial expansive processes. Six of them were in the 3rd ventricle; two in septum pellucidum and corpus callosum; and four in the pineal and mesencephalum. They are not very frequent processes. From the clinical point of view, they present a picture of endocraneal hypertension with rapid evolution. There are also other signs of important diagnostic value, which varied according to the location. We emphasize the value of the encephalography and the angiography for diagnosis. The E.E.G. studies gave only prognostic data. The clinical course was different in every case. It was better when the tumor was extirpated with or without ventriculo-peritoneal shunt. The most severe evolution as observed in the cases who had the tumor in the posterior part of the 3rd ventricle.