A rare evolutive vascular malformation disorder characterized by closely clustered irregular dilated capillaries that can be asymptomatic or that can cause variable neurological manifestations such as seizures, non-specific headaches, progressive or transient focal neurologic deficits, and/or cerebral hemorrhages. The disease is famililal cerebral cavernous malformations (Monarch Disease Ontology identifier MONDO_0031037). Also known as: familial brain cavernous angioma, familial brain cavernous hemangioma, familial cerebral cavernoma, familial cerebral cavernous malformation, hereditary brain cavernous angioma, hereditary brain cavernous hemangioma, hereditary cerebral cavernoma, hereditary cerebral cavernous malformation.