EROSION OF THE PETROUS BONE BY ACOUSTIC NERVE TUMOR: DEMONSTRATION BY ROENTGEN RAY

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Abstract
Acoustic nerve tumors are usually diagnosed without difficulty in advanced stages, because of the typical chronologic sequence of symptoms due to their origin from the eighth nerve. The first symptom is tinnitus, followed by deafness of the involved side. After a time, these are followed by signs of cerebellar incoordination due to pressure of the growing tumor in the cerebellopontile angle; by palsy of the fifth and seventh nerves, which are stretched over the tumor, and, finally, by symptoms of internal hydrocephalus due to pressure on the aqueduct of Sylvius. The interval between the onset of auditory symptoms and the appearance of the signs which make the diagnosis usually is prolonged. In Cushing's1 latest tabulation of his material, the recorded duration of auditory symptoms in forty-six cases varied from six months to seventeen years, and averaged five years before surgical treatment was instituted. During this interval the diagnosis

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