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John Kveton, Lahey Clinic Medical Center, Burlington, Mass, described two patients who experienced delayed spontaneous return of hearing after acoustic tumor surgery. His findings were reported at the January 1988 Eastern Section meeting of the Triological Society held in New York. In this series of patients undergoing acoustic tumor surgery with preservation of the cochlear nerve, 29% retained usable hearing postoperatively. Hearing loss may be secondary to direct mechanical trauma or vascular compromise of the cochlear nerve. Two patients with small tumors resected via the suboccipital approach regained significant hearing during the first year postoperatively. However, speech discrimination in these patients was low. These results point toward the possibility of a conduction block or neuropraxia of the cochlear nerve with potentially reversible hearing loss. The site of lesion for the conduction block is speculated to be at the transition zone between the peripheral and central segments of the cochlear nerve.
LEVINE TM. Delayed Hearing Recovery After Acoustic Tumor Surgery. Arch Otolaryngol Head Neck Surg. 1988;114(9):949–951. doi:10.1001/archotol.1988.01860210015004
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