[Colloid cysts in the 3rd cerebral ventricle]

Four out of a group of 5 patients with a colloid cyst located within the III cerebral ventricle were surgically treated by means of a classical microsurgical technique and one of them was treated stereotactically. The preference was given to the frontodorsal transcortical approach. The current CT diagnosis is reliable and by use of MR it is to a certain extent possible to distinguish even the origin of the cyst. Prior to examination we had found out that the cyst was a neuroenteral inclusion and the final surgical result was good in all patients who had been subdued to operation during the initial phase of foramen Monroi enclosure. (Fig. 2, Ref. 10.)