J Neurosurg 142:1751–1762, 2025
Most cerebral cavernous malformations (CCMs) are asymptomatic, especially Zabramski type IV. Symptoms, mainly seizures or neurological deficits, are primarily linked to Zabramski type I. Type I CCMs often regress to types II/III, but up to one-quarter develop new symptoms over time.
• Most cerebral cavernous malformations (CCMs) are asymptomatic and found incidentally on MRI.
• Zabramski classification is widely used to describe CCMs’ radiological features, but its correlation with clinical symptoms was not well established before this study.
• Zabramski type I CCMs are mostly symptomatic and associated with an unstable clinical course; types II and III are usually asymptomatic or have mild symptoms; type IV CCMs are always asymptomatic.
• Epileptic seizures are the most common presenting symptom, especially for supratentorial CCMs; infratentorial CCMs more often cause balance problems and cranial nerve deficits.
• Most Zabramski type I CCMs regress over time to type II or III; very few type II or III CCMs change to type I.
• Age is associated with Zabramski type: type I CCMs occur in younger patients, type III in older.
• Nearly all Zabramski type IV CCMs appear in patients with multiple CCMs and remain stable and asymptomatic over time.
• The Zabramski type at diagnosis can help predict the future clinical course of CCMs.


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