Clinical Characteristics and Treatment Outcomes for Patients With External Auditory Canal Cholesteatoma

Objective: We aimed to evaluate the clinical features and treatment outcomes for patients with idiopathic and secondary external auditory canal cholesteatoma (EACC), and to validate the treatment strategy from the perspective of hearing as well as etiology and staging. Study Design: Retrospective case series. Setting: Tertiary referral center and affiliated hospitals. Patients: Fifty-eight patients with idiopathic EACC and 14 patients with secondary EACC. Intervention: Conservative management and surgery. Main Outcome Measure: Air conduction (AC) pure-tone averages (PTAs) and mean air-bone gaps (ABGs). Results: There were no significant differences between hearing values before and after conservative management for idiopathic EACC patients with stages I–III, indicating that hearing abilities were preserved. For idiopathic EACC patients with stage IV disease treated with surgery, the AC PTA threshold and mean ABG significantly improved from a preoperative value of 60.3 dB HL to a postoperative value of 32.4 dB HL (p = 0.013), and from 34.3 to 9.5 dB HL (p 

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