Intraoperative Management of Lateral Semicircular Canal Fistula in Cholesteatoma Surgery: Retrospective Case Series and Audiovestibular Follow-Up.

Background and Objectives: To evaluate the surgical management and outcomes of lateral semicircular canal fistulas (LSCFs) in patients with middle ear cholesteatoma, focusing on hearing preservation and vestibular function. Materials and Methods: A retrospective study was conducted on nine adult patients diagnosed with LSCFs secondary to cholesteatoma who underwent surgery at a tertiary referral center between 2018 and 2024. The preoperative evaluation included otoscopy, audiometry, vestibular testing (HINTS), and high-resolution CT (HRCT) of the temporal bone. Surgical techniques included canal wall up (CWU) or canal wall down (CWD) mastoidectomy, depending on the disease extent. Cholesteatoma matrix removal from the fistula was performed carefully. Fistula closure involved layered grafts of temporalis fascia, temporalis muscle, and/or gelfoam. The postoperative follow-up included audiometry and vestibular assessments. Results: Nine patients with LSCFs were identified (one Type III, three Type IIb, and four Type I/IIa). Five patients were found to have additional disease complications intraoperatively, including facial nerve involvement and middle fossa dehiscence. Postoperatively, hearing outcomes varied, with some patients experiencing improvement, others demonstrating stable hearing, and some exhibiting further decline, particularly in cases with extensive disease. Vestibular symptoms, including vertigo, generally resolved postoperatively, although some patients required prolonged vestibular rehabilitation. Conclusions: LSCF management in cholesteatoma surgery requires a careful preoperative assessment, meticulous surgical technique, and individualized fistula closure based on the size and type. While hearing preservation remains a challenge, particularly in extensive cases, the "underwater technique" and layered grafting may contribute to minimizing further damage and promoting fistula closure. Vestibular rehabilitation plays a crucial role in managing postoperative balance issues. A long-term follow-up is essential to monitor for recurrence and assess both auditory and vestibular function.