[Radiology of central nervous system cavernomas].

MRI is the best radiological technique to explore cavernomas, vascular malformations affecting the entire central nervous system. The presence of blood degradation products produces a specific aspect which enables excellent contrast resolution. Certain diagnosis can be established with MRI which can also be used to follow growth and modifications, particularly in familial forms. In the emergency setting, the first exam is often a CT-scan for patients presenting acute neurological sign(s) and/or with a clinical suspicion of hemorrhagic stroke. Angiography is generally not contributive because cavernomas are occult vascular malformations. Nevertheless, this exam is often necessary when an associated vascular abnormality is suspected, particularly a developmental venous abnormality.