Abstract
Cavernous malformations, also known as cavernomas and cavernous angiomas, account for approximately 5% to 15% of all central nervous system vascular abnormalities. They have an incidence that ranges from 0.2 to 0.6 per 100,000 persons per year, with an annual hemorrhage rate that ranges from 0.5% to 11% per patient-year, but they most often present with seizures (50%) as opposed to acute hemorrhage (25%). They are most common among Hispanic Americans, and most are supratentorial, but 10% to 25% occur in the posterior fossa. Most advocate for surgical treatment after one hemorrhage for those lesions that are accessible, whereas inaccessible lesions often must have a few symptomatic hemorrhages before treatment is pursued because of the morbidity associated with treatment. In this chapter, we present a case of a patient with a cavernous malformation involving the right middle cerebellar peduncle.