Cerebral aneurysms

What Is a Cerebral Aneurysm?

A cerebral aneurysm, also known as a brain aneurysm or intracranial aneurysm, occurs when a weakened area within the wall of a blood vessel in the brain begins to bulge outward. Over time, pressure from blood flow may cause the weakened vessel wall to enlarge.

Cerebral aneurysms can develop in different areas of the brain circulation and vary considerably in size and shape. Some remain small and stable for many years, while others may enlarge progressively.

Many aneurysms do not cause symptoms unless they become large, place pressure on surrounding brain structures, or rupture. In some patients, aneurysms are discovered incidentally during MRI or CT imaging performed for headaches, dizziness, or unrelated neurological symptoms.

Patients diagnosed with a cerebral aneurysm in London often seek specialist neurosurgical assessment to better understand the condition, associated risks, and available treatment options.

Types of Cerebral Aneurysms

Several different types of cerebral aneurysms may occur within the brain circulation.

Saccular Aneurysm

Saccular aneurysms, sometimes referred to as berry aneurysms, are the most common type. These appear as rounded outpouchings arising from the blood vessel wall.

Fusiform Aneurysm

Fusiform aneurysms involve widening along a segment of the blood vessel rather than forming a distinct sac.

Dissecting Aneurysm

Dissecting aneurysms occur when a tear develops within the blood vessel wall, allowing blood to track between vessel layers.

The most appropriate management strategy depends on the aneurysm type, size, location, patient age, and overall neurological health.

Symptoms of a Cerebral Aneurysm

Many unruptured cerebral aneurysms do not produce noticeable symptoms. However, larger aneurysms or aneurysms pressing on surrounding nerves or brain structures may cause neurological symptoms.

Possible symptoms include:

• Persistent or severe headaches
• Pain behind the eye
• Blurred or double vision
• Facial numbness
• Difficulty with balance
• Neck pain
• Dilated pupil
• Visual disturbances
• Neurological weakness

Symptoms vary depending on the size and location of the aneurysm within the brain circulation.

Patients experiencing persistent headaches or unexplained neurological symptoms in London may benefit from specialist neurological assessment and imaging investigations.

What Happens if a Cerebral Aneurysm Ruptures?

A ruptured cerebral aneurysm is a serious medical emergency that causes bleeding around the brain, known as subarachnoid haemorrhage.

Symptoms of aneurysm rupture may include:

• Sudden severe headache
• Loss of consciousness
• Nausea and vomiting
• Neck stiffness
• Sensitivity to light
• Confusion
• Seizures
• Sudden neurological weakness

The headache associated with aneurysm rupture is often described as the “worst headache of life.”

Urgent emergency medical assessment is essential if rupture is suspected.

Causes and Risk Factors for Cerebral Aneurysms

The exact cause of cerebral aneurysm formation is not always fully understood. However, several factors may increase risk.

• High blood pressure
• Smoking
• Family history of aneurysms
• Age-related blood vessel changes
• Certain inherited connective tissue disorders
• Previous aneurysm history
• Vascular abnormalities

Some aneurysms may develop gradually over many years without causing symptoms.

How Cerebral Aneurysms Are Diagnosed

Diagnosis usually begins with neurological assessment and detailed imaging of the brain circulation.

Investigations may include:

• MRI brain scan
• CT scan
• CT angiography (CTA)
• MR angiography (MRA)
• Cerebral angiography

Modern imaging allows detailed assessment of aneurysm size, shape, and location, helping specialists determine the most appropriate management strategy.

Patients in London and Essex with suspected aneurysms may undergo advanced neurovascular imaging to assess treatment options and long-term monitoring requirements.

Treatment Options for Cerebral Aneurysms

Treatment recommendations depend on several factors, including aneurysm size, location, patient age, symptoms, and estimated rupture risk.

Observation and Monitoring

Some smaller aneurysms may be monitored with regular imaging scans to assess for changes over time.

Endovascular Coiling

Endovascular treatment involves accessing the aneurysm through blood vessels using minimally invasive catheter techniques.

Coils may be inserted into the aneurysm to reduce blood flow and lower rupture risk.

Surgical Clipping

Surgical clipping involves placing a small clip across the aneurysm neck to isolate it from normal circulation.

This procedure is performed using specialised microsurgical techniques.

The most appropriate treatment approach depends on detailed neurovascular assessment and individual patient factors.

Recovery After Cerebral Aneurysm Treatment

Recovery following aneurysm treatment varies depending on whether the aneurysm was ruptured or unruptured, the treatment approach used, and the patient’s overall neurological condition.

Many patients gradually return to normal activities following treatment and monitoring. Recovery may involve follow-up imaging, neurological assessment, and rehabilitation where necessary.

Ongoing specialist follow-up is important to monitor long-term vascular health and assess for any changes in the brain circulation.

When Should You Seek Specialist Assessment?

Patients experiencing persistent neurological symptoms, unexplained severe headaches, visual changes, or a family history of cerebral aneurysms may benefit from specialist assessment.

Mr Bhaskar Thakur is a consultant neurosurgeon in London with expertise in neurovascular and complex cranial conditions. Patients across Central London, Harley Street, and Essex may seek specialist evaluation for cerebral aneurysms and related neurological disorders.

Early diagnosis and careful assessment can help guide appropriate monitoring and treatment decisions while supporting long-term neurological health.

Reviewed by Mr Bhaskar Thakur

Mr Bhaskar Thakur is a consultant neurosurgeon specialising in neurovascular conditions, complex cranial disorders, minimally invasive neurosurgery, and advanced spinal surgery in London and Essex.