Chen Jianqing1,2,3, Chai Yongchuan1,2,3, Zhang Zhihua1,2,3, Jia Huan1,2,3, Wang Zhaoyan4,5,6, Wu Hao7,8,9. 1. Department of Otolaryngology-Head and Neck Surgery, Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, 639 Zhizaoju Road, Shanghai, 200011, China. 2. Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai, China. 3. Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China. 4. Department of Otolaryngology-Head and Neck Surgery, Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, 639 Zhizaoju Road, Shanghai, 200011, China. wzyent2019@163.com. 5. Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai, China. wzyent2019@163.com. 6. Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China. wzyent2019@163.com. 7. Department of Otolaryngology-Head and Neck Surgery, Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, 639 Zhizaoju Road, Shanghai, 200011, China. wuhao622@sina.cn. 8. Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai, China. wuhao622@sina.cn. 9. Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China. wuhao622@sina.cn.
Abstract
OBJECTIVE: To evaluate the feasibility of a microscope-assisted endoscopic transcanal transpromontorial approach (METTA) for the removal of small vestibular schwannomas (VS) limited to the internal auditory canal (IAC), and introduce a modification without external auditory canal (EAC) closure. METHODS: Between August 2018 and February 2019, seven patients with intrameatal VS underwent surgery in our center, endoscopic transcanal transpromontorial approach was applied in the first 2 patients and the rest 5 patients were operated via METTA. Treatment outcomes including efficacy of tumor resection, facial nerve outcome, operation time and post-operative course were recorded and analyzed. RESULTS: All seven patients were pathologically confirmed to have intrameatal VS. Total tumor removal was achieved in all cases. Two patients experienced cerebrospinal fluid leakage which resolved spontaneously within 5 days. The average operation time was 161.41 ± 18.42 min. All patients presented normal facial nerve function 1 month after surgery. CONCLUSION: The METTA was effective in the removal of intrameatal VS. It can be an alternative surgical option for intrameatal VS with no serviceable hearing.
OBJECTIVE: To evaluate the feasibility of a microscope-assisted endoscopic transcanal transpromontorial approach (METTA) for the removal of small vestibular schwannomas (VS) limited to the internal auditory canal (IAC), and introduce a modification without external auditory canal (EAC) closure. METHODS: Between August 2018 and February 2019, seven patients with intrameatal VS underwent surgery in our center, endoscopic transcanal transpromontorial approach was applied in the first 2 patients and the rest 5 patients were operated via METTA. Treatment outcomes including efficacy of tumor resection, facial nerve outcome, operation time and post-operative course were recorded and analyzed. RESULTS: All seven patients were pathologically confirmed to have intrameatal VS. Total tumor removal was achieved in all cases. Two patients experienced cerebrospinal fluid leakage which resolved spontaneously within 5 days. The average operation time was 161.41 ± 18.42 min. All patients presented normal facial nerve function 1 month after surgery. CONCLUSION: The METTA was effective in the removal of intrameatal VS. It can be an alternative surgical option for intrameatal VS with no serviceable hearing.