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  • Title: Retrocochlear mass lesion in mid-frequency sudden deafness.
    Author: Lin YT, Young YH.
    Journal: Otolaryngol Head Neck Surg; 2008 Jan; 138(1):13-7. PubMed ID: 18164987.
    Abstract:
    OBJECTIVE: This study retrospectively reviewed all cases of mid-frequency sudden deafness to understand the clinical significance of this hallmark finding. STUDY DESIGN: Retrospective study. SUBJECTS AND METHODS: From 1992 to 2006, a total of 556 patients with sudden deafness were experienced. Based on the audiographic configuration, these patients were classified into: flat-type group, 272 cases; high-frequency group, 146 cases; low-frequency group, 70 cases; mid-frequency group, 30 cases; and unclassified group, 38 cases. All patients underwent a battery of audiovestibular function testing. RESULTS: Among 556 sudden deafness patients, 17 patients (3%) were proved to have a retrocochlear tumor, including mid-frequency group (10), high-frequency group (4), flat-type group (2), and low-frequency group (1). Thus, the mid-frequency group had significantly higher (33%) association with a retrocochlear tumor than other groups. CONCLUSION: One-third of the patients with mid-frequency sudden deafness harbor a true retrocochlear mass lesion; hence, MR imaging is mandatory in such cases.
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