The authors review their experience and establish a neuro-radiologic orientation in the investigation and diagnosis of the space-occupying processes of cerebelar region. The methods of choice are the pneumo and iodo-ventriculography, the gaseous encephalography and vertebral-basilar angiography. Illustrative cases are presented. The important aspect is the exact anatomical localization, while the methods are secondary. The carrying-out of all the techniques is fundamental.