Technical principles in glioma surgery and preoperative considerations.

The goal of glioma surgery is maximal safe resection. These intrinsic brain neoplasms, however, lack a clear margin and frequently infiltrate eloquent areas of the brain thus making their surgical resection challenging. This review first focuses on discussion of preoperative investigations that aid in anatomical and functional tumor characterization that help define tumor extent and determine the feasibility of complete resection. The second part of this review outlines intraoperative adjuncts that help identify tumor infiltrated tissues during surgery to maximize the extent of resection. In addition, we discuss the principles of intraoperative functional cortical and subcortical mapping and monitoring that enable maximal tumor resection while minimizing the risk of postoperative neurological deficit. Combined use of different modalities before and during surgery is encouraged to meet surgical goals and to ensure best patient outcome.