Abstract
It is now well established that the electroencephalogram may be used to advantage to locate cerebral lesions through the intact skull (Walter, 1 Case and Bucy 2 and Williams and Gibbs 3 ). On the other hand, there is no evidence that deep-lying midline lesions may be localized by this technic, and subtentorial tumors similarly have been reported 4 as not being amenable to localization by the electroencephalogram. More recently Walter 1c has reported local pathologic alteration in a few cases of cerebellar tumor. The pathologic activity in each of these cases consisted of a focus of slow delta waves appearing behind the mastoid process and presumably localizing with respect to the side of the tumor. Additional evidence regarding tumors of the posterior fossa has arisen during our routine electroencephalographic observations on children with various neurologic disorders. Eight patients with neoplasms in this region have thus far been examined. In each
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