A Modified SISI Technique for Selected Cases with Suspected Acoustic Neurinoma

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Abstract
The conventional tests of hearing have not been shown to be consistently sensitive to the presence of acoustic tumors, when there is little or no acuity deficit in the affected ear. Two cases with later confirmed acoustic neuronoma were tested on a modified SISI with the tone administered at 75 dB and with increases of 1 dB at 20 dB above thresholds, which gave positive results in spite of the lack of appreciable hearing loss in the test ear, and at the frequency at which the test was administered. Both affected and normal ears were tested in these two subjects. In both subjects, there was 100% response to the increments in the normal ear and 0% in the suspected ear. Subsequent surgery confirmed the diagnosis.

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