Improved detection of diffuse glioma infiltration with imaging combinations: a diagnostic accuracy study

Area of Science:

• Neuro-oncology
• Medical Imaging
• Radiology

Background:

• Standard MRI (T2/FLAIR, T1G) guides glioma surgery and irradiation.
• Amino acid PET is emerging as a new standard for glioma imaging.
• Investigating imaging combinations may enhance diagnostic accuracy beyond standard methods.

Purpose of the Study:

• To evaluate the accuracy of combined imaging techniques in detecting glioma infiltration.
• To compare the diagnostic performance of various imaging modalities and their combinations.

Main Methods:

• Included 20 adults with newly diagnosed non-enhancing or enhancing gliomas.
• Utilized standardized preoperative imaging including MRI sequences and [18F]FET PET.
• Correlated imaging findings with multiregion stereotactic biopsies and neuropathological assessment.

Main Results:

• In enhancing gliomas, ADC MRI combined with [18F]FET PET showed superior tumor detection (AUC 0.89) versus T1G MRI (0.56) and [18F]FET PET alone (0.76).
• No combination significantly outperformed standard MRI for non-enhancing gliomas.
• FLAIR-weighted MRI (AUC 0.81) was superior to [18F]FET PET (0.69) in non-enhancing gliomas.

Conclusions:

• The combination of ADC MRI and [18F]FET PET enhances glioma infiltration detection in enhancing gliomas.
• This combined approach shows potential for improved guidance of local glioma therapy.
• Further research may refine imaging protocols for optimal glioma management.