Central Nervous System (CNS) Vasculitis: Symptoms, Causes & Treatment

CNS vasculitis causes inflammation and damage to the blood vessels of the brain and spinal cord, which can reduce or block blood flow. This may lead to serious neurological complications if not treated early. The main complications are listed below:

• Ischemic stroke
• Brain hemorrhage
• Transient ischemic attacks (TIAs) or mini-strokes
• Seizures
• Chronic or severe headaches
• Cognitive impairment and memory problems
• Weakness or paralysis
• Vision problems or speech difficulties
• Coordination and balance issues
• Coma or death (in severe cases) 

Ischemic stroke: A reduction in the blood supply to certain areas of the brain can result from the narrowing or blockage of inflammatory vessels in CNS vasculitis. An ischemic stroke results from this oxygen shortage, which damages brain tissue. Depending on the affected region, patients may experience sudden weakness, facial paralysis, or trouble speaking.

Brain haemorrhage: The inflammation of blood vessels can weaken the vessel walls, making them more likely to rupture. When a vessel breaks, it causes bleeding within the brain, known as a haemorrhage. This can lead to severe headache, vomiting, and sudden loss of consciousness.

Transient ischemic attacks (TIAs) or mini-strokes: Inflammation in CNS vasculitis can cause brain blood vessels to temporarily narrow, lowering blood flow. This results in short-lived stroke-like symptoms like weakness, slurred speech, or vision issues that go away in a span of minutes to hours. TIAs do not cause permanent brain damage, in contrast to a full stroke. They are an important sign, however, that if the condition is not treated right away, a major stroke could happen. To avoid further complications, immediate medical evaluation is crucial.

Seizures: Damage to brain tissue due to poor blood flow or bleeding can trigger abnormal electrical activity. This may result in seizures, which can appear as jerking movements, staring spells, or sudden loss of awareness. Recurrent seizures may require long-term treatment to control the condition.

Chronic or severe headaches: Inflammation of blood vessels in the brain often causes persistent headaches. These headaches may be severe and long-lasting because of ongoing irritation of vascular structures. They are commonly one of the early symptoms of CNS vasculitis.

Cognitive impairment and memory problems: Repeated injury to brain tissue can affect areas of the brain that are responsible for thinking and memory. Patients may develop confusion, difficulty concentrating, or personality changes. Over time, this can impact daily functioning and quality of life.

Weakness or paralysis: Reduced blood flow to motor control regions in the brain can weaken or stop the brain's signals to muscles. This often results in weakness or paralysis, particularly on one side of the body (hemiparesis or hemiplegia). The severity can range from mild weakness to complete loss of movement, depending on the extent of damage.

Vision problems or speech difficulties: If blood flow to areas controlling vision or speech is affected, patients may experience blurred vision, double vision, or difficulty in speaking. These symptoms may be temporary or permanent, depending on the extent of damage.

Coordination and balance issues: Normal body coordination may be affected by CNS vasculitis due to decreased blood flow to parts of the brain that regulate balance, like the cerebellum. Dizziness, unstable walking, or trouble maintaining posture could result from this. Additionally, patients may have trouble with precise movements, such as writing or picking up objects. These issues can interfere with day-to-day activities and raise the risk of falls.

Coma or death (in severe cases): In advanced or untreated CNS vasculitis, widespread damage to brain vessels can lead to severe brain injury. This may result in loss of consciousness or coma. In life-threatening cases, it can lead to death if not treated promptly.

Diagnosing CNS vasculitis requires a combination of clinical assessment, laboratory tests, and imaging studies because no single test can confirm it. Doctors use these investigations to detect inflammation in the brain's blood vessels and rule out other similar conditions. The main diagnostic tests are as follows:

• Medical history
• Physical examination
• Laboratory tests/blood tests
• Complete blood picture (CBP)
• Erythrocyte sedimentation rate (ESR)/ C-reactive protein (CRP)
• Autoimmune tests (ANA, ANCA)
• Infection screening 
• Cerebrospinal Fluid (CSF) Analysis
• Lumbar puncture
• CSF cell count, protein, glucose
• Brain Imaging
• Magnetic resonance imaging (MRI) of the brain
• Computed tomography (CT) brain
• Vascular Imaging
• Magnetic resonance angiography (MRA)
• Computed tomography angiography (CTA)
• Cerebral angiography (digital subtraction angiography))
• Advanced imaging
• Positron emission tomography (PET) scan
• Vessel wall magnetic resonance imaging (MRI)
• Confirmatory Test
• Brain biopsy
• Meningeal biopsy

There is no definitive cure, but CNS vasculitis treatment focuses on reducing inflammation of the brain's blood vessels and preventing further neurological damage. The aim is to control disease activity, prevent relapse, and preserve brain function. Careful monitoring and dose adjustment are essential to ensure effective and safe treatment. The treatment options for CNS vasculitis can be categorized as follows:

Non-pharmacological treatment

• Regular neurological monitoring
• Stroke risk control
• Physiotherapy
• Occupational therapy
• Cognitive therapy
• Healthy nutrition
• Psychological and Behavioural Support
• Avoidance of triggers (in secondary cases, e.g., infections)

Pharmacological treatment

• Corticosteroids
• Immunosuppressive therapy
• Antiplatelets 
• Targeted therapy
• Adjunctive therapy
• Proton pump inhibitors
• Antimicrobial prophylaxis
• Calcium and Vitamin D

Surgical interventions

• Decompressive craniectomy
• Surgical evacuation of a hematoma
• Ventriculoperitoneal (VP) shunt
• Extracranial-intracranial (EC-IC) bypass or revascularisation
• Angioplasty or stenting

Frequently Asked Questions (FAQs) on CNS vasculitis

Yes, CNS vasculitis are broadly classified into two main types based on their cause. Primary CNS vasculitis or primary angiitis of the CNS is limited only to the brain and spinal cord without involvement of other organs. Secondary CNS vasculitis occurs as part of another condition, such as systemic vasculitis, autoimmune diseases, infections, or certain cancers. This classification helps doctors understand the condition and plan care.

Central nervous system (CNS) vasculitis is a rare condition, with some studies estimating about 2.4 cases per 10 lakh persons in a year. Because of its rarity and varied symptoms, the exact global prevalence is not well defined, and some cases may go unrecognised. Overall, CNS vasculitis affects only a very small proportion of the population, most commonly seen in middle-aged people, although it can occur at any age.

The early signs of CNS vasculitis are often mild and can progress slowly. A new or persistent headache is the most common first symptom. People may also notice trouble with memory, thinking, or concentration, along with confusion or changes in behaviour. Some may experience weakness, numbness, or difficulty with balance and walking. In some cases, seizures or stroke-like symptoms can occur early in the condition.

CNS vasculitis can occur either as a primary condition, where the exact cause is unknown, or as a secondary condition due to other diseases. It is generally associated with autoimmune disorders such as lupus or rheumatoid arthritis and other systemic vasculitis. It may also be triggered by infections like tuberculosis, viral, or bacterial illnesses, which cause inflammation of blood vessels. In some cases, cancers or certain medications can also lead to this condition.

People with CNS vasculitis can improve their overall health and reduce complications by following healthy lifestyle measures. This includes maintaining a nutritional and balanced diet, regular physical activity, and adequate rest, which support brain and vascular health. Patients are advised to avoid smoking and reduce alcohol intake, as these can worsen blood vessel damage. It is also important to control blood pressure, blood sugar, and cholesterol levels, and manage stress to lower the risk of stroke and disease progression. Regular follow-up and adherence to medical advice further support long-term neurological outcomes.

CNS vasculitis can lead to several serious complications because of decreased or blocked blood flow to the brain. These include ischemic stroke or brain haemorrhage, which can result in vision loss, speech issues, or sudden weakness. Seizures, persistent headaches, and cognitive issues like confusion or memory loss can all be brought on by ongoing inflammation. Weakness, balance problems, or permanent neurological impairment may develop in certain patients. Complications can worsen to permanent brain damage, coma, or even death in extreme or untreated cases.

Yes, CNS vasculitis is an autoimmune inflammatory condition, especially in primary CNS vasculitis, where the immune system mistakenly attacks the blood vessels of the brain and spinal cord. It can also occur as a secondary condition due to infections, cancers, or systemic autoimmune diseases. Therefore, while many cases are immune-mediated, not all forms are purely autoimmune in origin.

There is no particular vitamin deficiency known to cause CNS vasculitis directly. However, severe deficiencies such as vitamin C deficiency (scurvy) can weaken blood vessel walls and lead to bleeding or inflammation of the vessels that may mimic vasculitis. Similarly, vitamin B deficiencies can contribute to nerve and vascular problems, but are not a primary cause of true vasculitis. Overall, vasculitis are mainly related to immune, infectious, or inflammatory causes rather than vitamin deficiency.

CNS vasculitis is a serious condition because it involves inflammation of the blood vessels in the brain. This can reduce blood flow and lead to complications such as headaches, seizures, confusion, or stroke-like symptoms. If not treated early, it may cause permanent brain damage or neurological disability. Prompt diagnosis and treatment are important to improve outcomes and prevent complications.

Consult a doctor for CNS vasculitis if there are persistent headaches, confusion, or new neurological symptoms such as weakness or vision problems. Signs that indicate a need for medical assistance are:

• Suddenly experiencing numbness or weakness in the arms, legs, or face
• Persistent or severe headaches that are new or worsening
• Confusion, memory problems, or changes in behaviour
• Difficulty speaking, understanding speech, or vision changes
• Seizures or episodes of loss of consciousness
• Problems with balance, coordination, or walking

If these symptoms continue, it is best to see a CNS vasculitis specialist for accurate evaluation and management. Seek emergency medical attention if there are sudden stroke-like symptoms, severe headache with vomiting, seizures, or loss of consciousness, as these may indicate serious complications. A neurologist, along with a rheumatologist when needed, can provide the right CNS vasculitis treatment to control inflammation and reduce long-term neurological risks.