ABR results in patients with posterior fossa tumors and normal pure-tone hearing.
Sixteen patients with confirmed mass lesions of the posterior fossa and normal hearing sensitivity for pure tones were studied. Patients' main symptoms, auditory brain-stem response (ABR), and lesion size were analyzed. All patients manifested neurologic and/or otoneurologic 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.
D000328:Adult; D000368:Aged; D001300:Audiometry, Evoked Response; D001301:Audiometry, Pure-Tone; D001932:Brain Neoplasms / Q000150:complications* / Q000175:diagnosis; D001933:Brain Stem / Q000503:physiopathology*; D002528:Cerebellar Neoplasms / Q000150:complications / Q000175:diagnosis; D002530:Cerebellopontine Angle / Q000000981:diagnostic imaging; D003388:Cranial Fossa, Posterior; D005072:Evoked Potentials, Auditory; D005260:Female; D006319:Hearing Loss, Sensorineural / Q000175:diagnosis* / Q000209:etiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009464:Neuroma, Acoustic / Q000150:complications* / Q000175:diagnosis; D014057:Tomography, X-Ray Computed