Management of Cavernomas >1 cm with Hemorrhage Risk

Risk Stratification by Size and Location

Cavernomas larger than 1 cm have a 4.5% annual hemorrhage risk if previously unbled, according to the American Heart Association, with deeper lesions carrying higher bleeding rates 2
The 5-year risk of recurrent bleeding jumps to 29.5% after a first hemorrhage, making the natural history significantly more dangerous, as stated by the American Association of Neurological Surgeons 1
Deeper lesions, such as those in the basal ganglia, thalamus, or brainstem, have higher bleeding rates than superficial locations, as reported by the American Stroke Association 3, 2
The 5-year risk of death or nonfatal stroke from an unbled cavernoma is only 2.4%, but this increases dramatically after hemorrhage, according to the American Heart Association 1

For symptomatic or previously hemorrhaged cavernomas >1 cm in superficial or easily accessible locations, surgical resection is recommended due to low surgical morbidity and increased rebleed risk, as suggested by the Congress of Neurological Surgeons 1, 4
The mortality and morbidity of surgery equals approximately 2 years of living with the lesion, making early intervention favorable, according to the American Association of Neurological Surgeons 4
Postoperative risk becomes more favorable compared to the 29.5% five-year risk after first hemorrhage, as stated by the American Association of Neurological Surgeons 1
For deep locations, such as the insula, basal ganglia, or thalamus, surgical resection may be considered if symptomatic or after prior hemorrhage, with a surgical risk-benefit ratio equal to approximately 5-10 years of living with the lesion, as reported by the American Association of Neurological Surgeons 1, 4

For cavernomas causing epilepsy, early surgical resection should be considered, especially for medically refractory seizures, as suggested by the American Epilepsy Society 1, 4
Radiosurgery may be considered for symptomatic hemorrhaged cavernomas in eloquent areas with unacceptably high surgical risk, but is not recommended for asymptomatic cavernomas or surgically accessible lesions, according to the American Association of Neurological Surgeons 1, 4

Delaying surgery in symptomatic accessible lesions after first hemorrhage is not recommended, as the 29.5% five-year rebleed risk far exceeds surgical risk, as stated by the Congress of Neurological Surgeons 1
Premature surgery in asymptomatic deep or brainstem lesions should be avoided, as surgical risk exceeds natural history risk, according to the American Association of Neurological Surgeons 1, 4

For conservatively managed lesions, repeat MRI with gradient-echo or SWI sequences is recommended if new neurological symptoms, seizures, or examination changes develop, as suggested by the American College of Radiology 5