The object of this communication is, first, to evaluate, if possible, the aid that can be obtained for localization of lesions in the posterior fossa by a study of the caloric responses obtained in cases of such lesions and, secondly, to compare the accuracy of such localization with that suggested by a study of the clinical findings in each case.
For the purpose of this study we have used cases in which the diagnosis has been verified either by operation or at autopsy and in which the caloric tests were performed by members of the otologic staff of the hospital. We regarded as "verified by operation" only those cases in which the pathologic process was seen or removed by the surgeon; "verified by autopsy" refers only to macroscopic observations made post mortem. We have no evidence as to what the effects of these lesions were on the various pathways,