Radiation-Induced Imaging Changes and Cerebral Edema following Stereotactic Radiosurgery for Brain AVMs

Area of Science:

• Neurology
• Radiology
• Medical Imaging

Background:

• Stereotactic radiosurgery (SRS) is a treatment for brain arteriovenous malformations (AVMs).
• Post-treatment imaging changes, including T2 signal and FLAIR alterations, can occur and may indicate adverse radiation effects.
• Understanding these changes is crucial for patient management and outcome prediction.

Purpose of the Study:

• To evaluate the outcomes of patients with post-treatment T2 signal and FLAIR changes after SRS for brain AVMs.
• To determine the frequency and extent of these imaging responses.
• To identify factors associated with the development of radiation-induced imaging changes.

Main Methods:

• Retrospective cohort study of patients treated with SRS for brain AVMs.
• Inclusion criteria: at least 1 year of follow-up MR imaging.
• Logistic regression analysis was employed to identify predictors of outcomes.

Main Results:

• 40% of treated AVMs showed new T2 signal and FLAIR hyperintensity.
• Radiation-induced imaging changes peaked around 12 months post-treatment.
• Patients with imaging changes had a significantly higher incidence of new neurologic symptoms (69.2% vs. 9.5%).
• Larger AVM maximal diameter and multiple feeding arteries were associated with radiation-induced imaging changes.

Conclusions:

• Radiation-induced imaging changes are frequent after SRS for brain AVMs.
• These changes are significantly associated with new neurologic findings.
• The findings highlight the importance of monitoring imaging changes for potential adverse effects.