[The diagnosis of subtentorial tumours by vertebral angiography (author's transl)].

The diagnosis of space-occupying lesions in the subtentorial space by vertebral angiography is based upon a good knowledge of arteries and veins and topographic points of this region. An imaginary line between the colliculo-central point and the chorioidal point divides the posterior fossa into two imaginary parts. In this way it is possible to localize displacements in the region of the posterior fossa. Of course, the displacement of the veins and arteries is very important in the verification of the tumours. Consequently, vertebral angiography is of vital importance in the investigation of space-occupying lesions in the posterior fossa.