CONVENTIONAL neuroradiological techniques allow accurate location and fairly accurate identification of intracranial masses. Unfortunately, these procedures necessitate admission to hospital, cause some discomfort, and are not free from danger. Moreover, carotid angiography cannot reliably demonstrate lesions situated posteriorly in the hemispheres and, as it relies mainly on the detection of d...

WHERE knowledge of a medical condition is incomplete, there is a danger that the results of ancillary aids, especially when expressed in numerical terms, may acquire an unwarranted appearance of infallibility. The post-concussional state provides a good example of this tendency, for, while the core of the problem remains obscure, the results of investigations which have only presumptive relatio...