One-stage tumor resection and cranioplasty for skull tumors using custom-made implants are beneficial for reducing patient burden, minimizing complications, and improving cosmetic outcomes. However, accurately determining the craniotomy line remains challenging. This technical note describes a method for integrating implant design data into a navigation system to facilitate accurate 1-stage surgery for skull and scalp tumors. Merged images of the implant design data and preoperative computed tomography scans were …