Electroencephalographic Changes in Cerebellar Degenerative Lesions

Following the rapid extension of electroencephalo- graphy in the investigation of all forms of intra- cranial affection in clinical neurology, it soon became apparent that tumours in the posterior fossa greatly complicated the electroencephalogram. Numerous early publications, including the work of Grey Walter (1936, 1937, and 1938) and that of Bickford and Baldes (1947), gave conflicting information and seemed only to indicate that there was no pattern of electrical abnormality characteristic of a posterior fossa disturbance.However, Bagchi, Lam, Kooi, and Bassett (1952) reported their electroencephalo- graphic experiences over a period of seven years gained from examining 37 patients, all of whom had proven posterior fossa tumours.Their findings indicated that 32 of these patients had abnormal records and that the abnormality consisted either of Clinical Material Greenfield (1954) pointed out that it is not always possible, indeed it is rarely possible, to establish with certainty in life the particular type of cerebellar 326Protected by copyright.