THE EXPERIENCE of the last few years has proven that the number of acoustic tumors found is in direct relationship to the index of suspicion for such a lesion by the otologist. The possibility of an acoustic tumor should be entertained in all cases of unilateral cochlear or vestibular loss of unknown origin. As pointed out by the previous speaker, these patients should undergo an accurate neurological and audiometric evaluation. However, even the most sophisticated audiometric study is far from being a reliable and consistent test for the diagnosis of space occupying lesions in the internal auditory canal and cerebellopontine angle cistern. In a recent article, E. W. Johnson1 after reviewing the audiometric data in 163 surgically confirmed retrocochlear lesions states "Positive audiometric results indicate a strong probability of a retrocochlear lesion but the absence of these positive findings cannot of itself rule out the possibility of such a
Valvassori GE. Diagnosis of Acoustic Neuromas. Arch Otolaryngol. 1969;89(2):285–289. doi:10.1001/archotol.1969.00770020287010
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