The latter name is not quite accurate because at least one of the lesions is visible on angiography.
Cavernous malformations are more common than venous angiomas.
Causes There is no known specific cause of either the cavernous malformation or the venous angioma. The cavernous malformations, however, may be seen as an inherited problem in some cases. They are also seen frequently as incidental findings on an MRI performed for another reason. Venous angiomas rarely cause symptoms and are almost always incidental findings. They may be seen on CT scans, MRI scans and angiograms.