SRS for Cavernous Malformations: Myths and Realities.

Area of Science:

• Neurosurgery
• Radiation Oncology
• Neurology

Background:

• Optimal management of cavernous malformations (CMs) is debated.
• Stereotactic radiosurgery (SRS) is increasingly used for deep or high-risk CMs.
• Unlike arteriovenous malformations (AVMs), CM obliteration lacks imaging confirmation.

Purpose of the Study:

• To review contemporary stereotactic radiosurgery (SRS) techniques for cavernous malformation (CM) management.
• To evaluate the efficacy and safety of SRS in treating CMs, particularly deep-seated or eloquent lesions.
• To strengthen the recommendation for proactive SRS in symptomatic CMs based on recent evidence.

Main Methods:

• Review of contemporary SRS protocols and outcomes for CMs.
• Analysis of clinical response gauged by reduced hemorrhage rates.
• Comparison of SRS outcomes with natural history and microsurgery data.

Main Results:

• Modern SRS protocols show reduced toxicity (5%-7%) and morbidity.
• Class II, Level B evidence supports SRS for symptomatic, high-surgical-risk CMs in eloquent areas.
• Untreated brainstem and thalamic CMs exhibit higher hemorrhage rates and neurological sequelae than previously reported.

Conclusions:

• Proactive SRS is recommended for symptomatic deep-seated CMs due to high morbidity associated with observation and microsurgery.
• Patient selection is crucial for successful SRS outcomes in CM management.
• Contemporary SRS techniques offer a viable, less morbid alternative for specific CM patient populations.