Brain & Nervous System Stroke Causes & Risk Factors Cavernous Malformations and Stroke By Jose Vega MD, PhD Jose Vega MD, PhD LinkedIn Jose Vega MD, PhD, is a board-certified neurologist and published researcher specializing in stroke. Learn about our editorial process Updated on October 11, 2021 Medically reviewed by Huma Sheikh, MD Medically reviewed by Huma Sheikh, MD Facebook LinkedIn Twitter Huma Sheikh, MD, is a board-certified neurologist, specializing in migraine and stroke, and affiliated with Mount Sinai of New York. Learn about our Medical Expert Board Print A cavernous malformation is a rare type of vascular malformation, and those who have it are at risk of suffering a hemorrhagic stroke. More specifically, a cavernous malformation is a small nest of abnormal blood vessels located inside the tissue of a given body organ, such as bone, intestine or brain. When cavernous malformations occur in the brain they can be particularly problematic. In general, cavernous malformations consist of thin-walled veins, which lack major incoming arteries, and are fully separate from the tissues where they live. As such, cavernous malformations tend to be smaller and less dangerous than the more prominent arteriovenous malformations. Morsa Images/Digital Vision/Getty Images Do Cavernous Malformations Cause Bleeding? In spite of being small, cavernous malformations have a significant tendency to cause bleeding in the brain. The bleeding, however, is typically small, self-contained and relatively minor. In a fraction of the cases, however, bleeding is unusually large and cause a life-threatening hemorrhagic stroke. Once a cavernous malformation bleeds, it carries a high risk of re-bleeding, especially within the following two to three years. How Are Cavernous Malformations Diagnosed? Typically, cavernous malformations are diagnosed by MRI. They have the appearance of a small mass with blood deposits around it. Sometimes, however, it is impossible to differentiate a cavernous malformation from small tumors or infections, so your healthcare provider may choose to perform further tests to arrive at a final diagnosis. Who Gets Cavernous Malformations? Cavernous malformations occur in approximately 0.5 percent of the population. Some cases are familial, meaning that they occur in multiple members of the same family. This suggests that in these cases, there may be an underlying genetic cause. What Are the Symptoms? Typically, cavernous malformations do not cause any symptoms, but after they bleed, they can cause seizures, headaches and other stroke symptoms. What Is the Treatment? Some symptoms, such as seizures, can often be controlled with medicines. In cases in which medicines are not sufficient, however, surgery to remove the cavernous malformation from the brain can be performed. When successful, this surgery can completely cure seizures in many patients. If significant bleeding has already occurred, the surgery can prevent further bleeding episodes. Another modality of treatment available for cavernous malformations is stereotactic radiosurgery. Since there are some potentially dangerous long-term side effects of this therapy, though, this is not typically performed unless surgery is not a possibility. 3 Sources Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Kim J. Introduction to cerebral cavernous malformation: a brief review. Korean Science for Biochemistry Molecular Biology Reports. 2016;49(5):255-262. doi. 10.5483/bmbrep.2016.49.5.036. Horne MA, Flemming KD, Su I-C, et al. Clinical course of untreated cerebral cavernous malformations: a meta-analysis of individual patient data. The Lancet Neurology. 2016;15(2):166-173. doi. 10.1016/S1474-4422(15)00303-8. Arauz A, Patiño-Rodriguez HM, Chavarria-Medina M, Becerril M, Longo GM, Nathal E. Rebleeding and outcome in patients with symptomatic brain stem cavernomas. CED. 2017;43(5-6):283-289. doi. 10.1159/000463392. Additional Reading Robinson JR, Awad IA, Little JR.: Natural history of the cavernous angioma. J Neurosurg 75:709–714, 1991. By Jose Vega MD, PhD Jose Vega MD, PhD, is a board-certified neurologist and published researcher specializing in stroke. See Our Editorial Process Meet Our Medical Expert Board Share Feedback Was this page helpful? Thanks for your feedback! What is your feedback? Other Helpful Report an Error Submit