A stereotaxic system is described that uses computerized tomography scanning for target localization. This system is unique in that the sterotaxic localization may be carried out using the scanner computer without the addition of any extra software. The hardware of the system is built up around a base plate which is fastened to the scanner's patient table. The head is positioned and fixed to the base plate with aluminum bars, which are fixed to the calvaria with screws. Various stereotaxic devices may be fastened to the base plate. The system has been in clinical use for 4 months at the time of writing. Its main application has been in tumor biopsies, but it has also been used for functional operations.