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Locating a precise point in intracranial space for therapeutic purposes, in an ac curate manner with a minimum of risk, is the aim of stereotactic neurosurgery. This involves a series of procedures with certain sources of error. The ideal radiologic method would allow the following conditions to be fulfilled:(1) obtaining images with a high degree of definition making possible exact lo calization of points and lines of reference,(2) performing intra-operative ventriculography with instruments in situ in such a way as to be able to relate intracerebral structures with the stereotactic equipment on the same film, and(3) ease of execution causing minimum of disturbance, so that the procedure will be possible to perform also in patients under local anesthesia.Encephalography or ventriculography using gas as contrast medium only partly fulfil these conditions. This may lead to errors of location which have to be cor rected, either extending or complicating the operation itself. In search of another contrast medium initially Hypaque in a 30 per cent solution was used, later substi tuted by Conray, also in a 30 per cent solution (POBLETE & LIFSCHITZ 1969). The results obtained have led to the use of this contrast medium routinely. From 1968 to date 304 ventriculographies have been undertaken.

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