Clinical Scorecard: Progress in MRI Techniques for Glioma: Essential Insights for Neurosurgeons

At a Glance

Key Highlights

• MRI is central to glioma care, providing superior soft tissue contrast and advanced physiological imaging techniques.
• Perfusion MRI techniques (DSC, DCE, ASL) offer insights into tumor vascular physiology and grade, each with distinct advantages and limitations.
• Diffusion-weighted imaging (DWI) and diffusion tensor imaging (DTI) assess tumor cellularity and white matter tract integrity, aiding surgical planning.

Guideline-Based Recommendations

Diagnosis

• Use integrated molecular diagnostics alongside MRI for glioma classification per 2021 WHO CNS tumor guidelines.
• Employ conventional MRI sequences (T1, T2) combined with advanced techniques (perfusion, diffusion, spectroscopy) for tumor characterization.

Management

• Select perfusion MRI technique based on clinical question, lesion characteristics, and patient factors (e.g., contraindications to gadolinium).
• Incorporate DTI for white matter tract mapping to guide maximal safe surgical resection.
• Use MRI findings to stratify patients for treatment planning and clinical trials.

Monitoring & Follow-up

• Apply perfusion MRI to assess treatment response and detect tumor progression or recurrence.
• Utilize ASL for longitudinal studies requiring multiple scans without contrast exposure, especially in vulnerable populations.

Risks

• DSC perfusion MRI is sensitive to susceptibility artifacts and may be inaccurate near hemorrhage, calcification, or surgical materials.
• DCE perfusion MRI requires complex post-processing and has variable protocols limiting standardization.
• ASL has lower spatial resolution, is motion sensitive, and may underestimate perfusion in slow flow regions.

Patient & Prescribing Data

Glioma patients including those with contraindications to gadolinium contrast (e.g., renal impairment, pediatric patients).

MRI perfusion and diffusion techniques guide surgical and therapeutic decisions, with non-contrast ASL preferred when gadolinium is contraindicated.

Clinical Best Practices

• Integrate molecular diagnostics with MRI findings for accurate glioma classification and prognosis.
• Choose MRI perfusion technique tailored to lesion characteristics and patient safety considerations.
• Use DTI-based fiber tractography to minimize neurological deficits during surgical resection.
• Recognize technical limitations of each MRI modality to interpret imaging accurately.
• Employ advanced MRI techniques for comprehensive tumor assessment throughout treatment continuum.

References

• WHO Classification of CNS Tumors 2021
• Dynamic Susceptibility Contrast MRI (DSC)
• Dynamic Contrast-Enhanced MRI (DCE)
• Arterial Spin Labelling (ASL) in Brain Tumors
• Diffusion Weighted Imaging and Diffusion Tensor Imaging