Methods are disclosed for treating and preventing vascular instability diseases, such as cerebral cavernous malformation, by the administration of tempol, cholecalciferol, derivatives thereof, pharmaceutically-acceptable salts thereof, or combinations thereof. Methods are disclosed for reducing the number of cerebral cavernous malformation (CCM) lesions in a patient having, or at risk of developing, at least one CCM lesion. Methods are disclosed for reducing the growth rate of the number of cerebral cavernous malformation (CCM) lesions in a patient having, or at risk of developing, at least one CCM lesion. Method are disclosed for preventing or treating a sign or symptom of cerebral cavernous malformation (CCM) in a patient with at least one CCM lesion. Methods are disclosed for decreasing cerebrovascular inflammation, reducing cerebrovascular permeability, or both, in a patient having, or at risk of developing, a cerebral cavernous malformation (CCM) lesion. Methods are disclosed for improving cerebrovascular health in a patient having, or at risk of developing, a cerebral cavernous malformation (CCM) lesion.
