Imaging of the Posttherapeutic Brain

Area of Science:

• Neuro-oncology
• Radiology
• Medical Imaging

Background:

• Glioblastoma multiforme (GBM) is an aggressive brain tumor requiring careful post-treatment monitoring.
• Accurate imaging evaluation is crucial for assessing treatment response and guiding further management.
• Established criteria exist but have limitations in the post-therapy setting.

Purpose of the Study:

• To review key aspects of imaging glioblastoma multiforme after therapy.
• To discuss the Macdonald criteria and Response Assessment in Neuro-Oncology (RANO) criteria.
• To explore advanced magnetic resonance imaging (MRI) techniques for post-therapeutic brain evaluation.

Main Methods:

• Review of existing literature and established guidelines.
• Discussion of the Macdonald criteria and RANO criteria.
• Overview of advanced MRI techniques: perfusion, diffusion, and spectroscopy.

Main Results:

• The Macdonald and RANO criteria are essential but have limitations in differentiating treatment effects from tumor progression.
• Pseudoprogression and pseudoresponse are common challenges in post-therapy imaging.
• Advanced MRI techniques offer complementary information for improved diagnostic accuracy.

Conclusions:

• Accurate post-therapy imaging evaluation of glioblastoma is complex.
• Understanding the limitations of current criteria and leveraging advanced MRI techniques are vital.
• Further research may refine imaging protocols for better patient outcomes.