NEUROVASCULAR DECOMPRESSION OF THE 8TH CRANIAL NERVE IN PATIENTS WITHHEMIFACIAL SPASM AND INCIDENTAL TINNITUS - AN ALTERNATIVE WAY TO STUDY TINNITUS

Object. The authors sought to clarify the clinical characteristics of tinnitus resulting from neurovascular compression (NVC) of the eighth cranial nerve. Methods. The authors explored the eighth cranial nerve in the cerebellopontine cistern during neurovascular decompression (NV D) of the facial nerve in 10 patients with hemifacial spasm who suffer ed from incidental tinnitus on the same side. The diagnosis of NVC of the eighth cranial nerve was confirmed in all patients. This condition was found in only seven of 114 patients with hemifacial spasm alone, indicating that NVC of the eighth cranial nerve is one of the causes o f tinnitus (p < 0.001, chi-square test). The tinnitus resolved or was markedly improved after NVD of the eighth cranial nerve in eight patie nts (80%). Both pulsatile and continuous tinnitus responded well to NV D. All patients experienced various degrees of sensorineural hearing d isturbance, but other neurotological examinations provided poor diagno stic value. Conclusions. It is the authors' opinion that sensorineural hearing loss and positive findings on magnetic resonance imaging are the most reliable evidence for the presence of tinnitus caused by NVC of the eighth cranial nerve.