Awake Surgery Techniques in Low-Grade Glioma Management

Awake surgery for low-grade glioma has emerged as a paradigm-shifting strategy that balances maximal tumour removal with preservation of critical brain functions. By maintaining patient consciousness during key phases of the operation, neurosurgeons can employ real-time mapping of speech, motor control and higher cognitive processes. This approach relies on direct electrical stimulation of cortical and subcortical pathways to identify “eloquent” regions that must be spared. Over the past decade, advances in intraoperative monitoring, neuroimaging integration and understanding of brain network plasticity have allowed surgeons to push resection boundaries while safeguarding quality of life. The overarching aim is to achieve the greatest possible extent of resection—shown to correlate with longer progression-free and overall survival—without inflicting irreversible deficits. When integrated into a broader multimodal workflow that includes preoperative functional MRI, diffusion tensor imaging and postoperative neurorehabilitation, awake techniques foster personalised onco-functional decision-making and a longitudinal treatment course that adapts to evolving tumour behaviour and brain reorganisation.

Research from Nature Portfolio

A near-randomised long-term study assessed the impact of initial biopsy versus resection on survival in adults with diffuse low-grade glioma. Patients allocated to resection experienced significantly higher five-year overall survival than those managed by biopsy alone, but this benefit was confined to cases in which postoperative residual volume remained below a critical threshold. The findings underscore that maximal safe removal is most effective when guided by accurate prediction of resection boundaries. This work has reinforced the imperative for precise intraoperative mapping and volumetric analysis in awake procedures, highlighting residual tumour volume as a key predictor of outcome.

Awake Surgery Techniques in Low-Grade Glioma Management publication trend

The graph below shows the total number of articles in awake surgery techniques in low-grade glioma management across all publications each year (not limited to Nature Index journals).

Technical terms

Awake craniotomy: A surgical procedure performed with the patient conscious to allow intraoperative functional testing.

Direct electrical stimulation: Application of small currents to brain tissue to transiently disrupt function and map critical areas.

Neuroplasticity: The brain’s capacity to reorganise connections in response to injury or slow-growing lesions.

Eloquent cortex: Brain regions essential for key functions such as language, motor control or sensation, whose damage causes noticeable deficits.

Extent of resection: The proportion of tumour tissue removed, often quantified by postoperative imaging to predict clinical outcome.

References

1. Brain Plasticity Profiling as a Key Support to Therapeutic Decision-Making in Low-Grade Glioma Oncological Strategies. Cancers (2023).
2. Delineation of Grade II and III Gliomas Investigated by 7T MRI: An Inter-Observer Pilot Study. Diagnostics (2023).
3. Continuous Real-Time Neuropsychological Testing during Resection Phase in Left and Right Prefrontal Brain Tumors. Current Oncology (2023).
4. Residual Tumor Volume as Best Outcome Predictor in Low Grade Glioma – A Nine-Years Near-Randomized Survey of Surgery vs. Biopsy. Scientific Reports (2016).