Non-enhancing gliomas: does intraoperative ultrasonography improve resections?

Area of Science:

• Neurosurgery
• Oncology
• Medical Imaging

Background:

• Non-enhancing diffuse gliomas present significant surgical challenges due to difficulties in preoperative imaging and intraoperative visualization.
• Accurate delineation of tumor extent is crucial for optimizing surgical resection and patient outcomes.

Purpose of the Study:

• To evaluate the utility of navigated 3-dimensional ultrasonography (US) in the surgical management of non-enhancing gliomas.
• To compare the delineation capabilities of preoperative magnetic resonance imaging (MRI) and intraoperative US for these tumors.
• To assess the impact of intraoperative US on the extent of tumor resection.

Main Methods:

• Retrospective analysis of 55 non-enhancing glioma cases operated on using navigated 3D US.
• Comparison of tumor delineation between preoperative MRI and intraoperative US.
• Evaluation of US accuracy in predicting residual tumor status post-resection.
• Calculation and recording of the extent of tumor resection.

Main Results:

• Intraoperative US demonstrated superior tumor delineation compared to MRI in 56% of cases.
• Gross tumor resection was achieved in 51% of patients.
• US correctly predicted residual tumor status in 78% of cases.
• Radical resections were facilitated by US, even for tumors initially considered unresectable.

Conclusions:

• Intraoperative US is a valuable tool for guiding the resection of non-enhancing gliomas.
• US may offer improved tumor delineation over MRI, potentially enhancing resection rates.
• Despite US advancements, the proximity to eloquent brain areas remains the primary limitation for achieving complete resection.