Abstract
Sixteen patients with confirmed mass lesions of the posterior fossa and normal hearing sensitivity for pure tones were studied. Patients' main symptoms, auditory brainstem response (ABR), and lesion size were analyzed. All patients manifested neurologic and/ or ofoneurologic symptoms or complained of hearing difficulty disproportionate to their pure-tone findings. Interestingly, the patients in this select group were younger (mean = 34 years) than the typical patient with a posterior fossa tumor. ABR results were abnormal in 15 of the patients, although several indices—including absolute and interwave latencies, interaural latency difference, and wave presence/absence—were employed to achieve this sensitivity. Lesion size varied considerably and failed to correlate with ABR or pure-tone results.
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