Computed tomograpy and neuroradiology: a fortunate primary union.

Computed tomography (CT) has led to extensive reassessment of and alterations in the practices of neuroscientists. Many of these alterations and their implications are described. The progress and problems encountered in the past 36 months are reported as well as the trends of future investigations. The principles evolving should apply in many situations as the benefits of CT are extended to other portions of the body.