Abstract:Objective To evaluate the practical efficacy and value of 3D-Slicer software assisted endoscopic transsphenoidal surgery for pituitary adenoma.Methods There were 28 patients with pituitary adenoma included. Their image data were input into 3D-Slicer software. The three-dimensional reconstruction of sphenoid sinus, sellar region, pituitary adenoma, internal carotid artery and optic nerve were performed. Preoperative planning was performed to determine the spatial relationship among these structures. The process of removing sellar bottom was simulated. The reconstructed images were compared with intraoperative images to evaluate the degree of anastomosis and the postoperative complications.Results The three-dimensional reconstructed images of all patients showed clear visualization of the sphenoid sinuses, the bony structures of the sellar region, the pituitary adenoma, and the neurovasculature, which were well matched with the actual intraoperative endoscopic images and could accurately identify the important structures and plan out the appropriate extent of the bone window of the sellar base. All surgical patients have successfully completed the procedur, and none developed severe comorbidities after surgery.Conclusion The application of 3D-Slicer software in transsphenoidal endoscopic surgery of pituitary adenoma is helpful to visualize the spatial relationship between sphenoid sinus, sellar region, tumor and blood vessels and nerves, and improve the safety and effectiveness of surgery.