목적: Vestibular schwannoma (VS), also known as acoustic neuroma, poses challenges in hearing preservation for patients undergoing various treatment modalities. Cochlear implantation (CI) is effective in restoring binaural hearing in single-side deafness, but its application following VS resection raises concerns about MRI surveillance due to implant-related artifacts. This study explores the impact of CI magnet position on the visibility of inner ear structures in postoperative MRI scans for patients with VS. 방법:A retrospective analysis was conducted on patients who underwent CI simultaneously with VS resection or sequentially after Gamma-knife surgery. The CI magnet position was optimized in posterosuperior areas to improve MRI visualization. Postoperative brain MRI images were analyzed for artifact presence and cochlear and internal auditory canal (IAC) visibility. Postoperative brain CT scans underwent 3D reconstruction, and measurements of distances and angles were conducted to assess the positioning of the cochlear implant magnet. 결과:The study included six patients, with posterosuperior CI magnet placement in five cases and conventional placement in one case. Measurement analysis revealed that in four patients with unobstructed inner ear visibility, the distances from the external auditory canal (EAC) to the magnet and from the IAC to the magnet exceeded 90mm. Conversely, in two patients with obscured inner ear structures due to artifacts, these distances were all less than 90mm. 결론:This study highlights the importance of considering CI magnet position in posterosuperior areas for improved visibility in postoperative MRI scans following VS resection. Specifically, a critical threshold of 90mm for distances from EAC to the magnet and from IAC to the magnet is associated with unobscured inner ear visibility. Conducting a preoperative MRI with a superficially positioned and bandage-wrapped CI device may assist in identifying an optimal position that minimizes artifacts during postoperative MRI scans.