A CT scan is a vital tool in diagnosing and managing brain aneurysms, providing detailed images of the brain's blood vessels and structures. It’s natural to feel anxious about the process, but rest assured, the scan is quick, painless, and highly effective. If you’re concerned about preparation or what to expect, this blog post answers some of your commonly asked questions and ensure you feel informed and comfortable.
Introduction to Brain Aneurysm CT Scan: Frequently Asked Questions
It is estimated that about three percent of Singapore's population has a brain aneurysm. However, only very few of those aneurysms will rupture. A CT scan is one of many valuable ways of brain aneurysm detection, offered by our brain aneurysm specialist, Dr. Manish Taneja, at the Supreme Vascular and Interventional Clinic's, specialized brain clinic in Singapore. This article is part of our Brain Aneurysm Questions & Answers guide, covering common patient questions about treatment options, recovery, monitoring, and long-term follow-up.
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Common Questions About CT Scans for Brain Aneurysms
Can a CT scan detect a brain aneurysm?
A standard CT scan is excellent for detecting bleeding in the brain, particularly if a brain aneurysm has ruptured. However, it does not always show an unruptured brain aneurysm.
If doctors suspect a brain aneurysm, a CT angiography (CTA) is often recommended. CTA uses contrast dye to produce detailed images of the brain's blood vessels, allowing specialists to identify aneurysms, assess their size and shape, and plan appropriate management.
What is the difference between a CT scan and a CT angiogram (CTA)?
Although both use CT technology, they serve different purposes.
- CT brain scan evaluates the brain tissue and is commonly performed in emergencies to detect bleeding or other brain abnormalities.
- CT angiography (CTA) focuses on the blood vessels and is designed to identify aneurysms, narrowed arteries and other vascular conditions.
A specialist will recommend the most appropriate scan based on your symptoms and medical history.
Is a CT scan enough to diagnose every brain aneurysm?
Not always. Depending on the aneurysm's size, location and complexity, additional imaging may be recommended, including:
- CT angiography (CTA)
- Magnetic resonance angiography (MRA)
- Cerebral angiography (digital subtraction angiography)
Each imaging technique provides different information, helping specialists understand the aneurysm's anatomy and determine the most appropriate management strategy.
When is a CT scan performed for suspected brain aneurysms?
A CT scan is commonly performed if someone presents with:
- A sudden severe headache
- Suspected bleeding in the brain
- Stroke-like symptoms
- Sudden neurological changes
- Head injury with concerning neurological symptoms
If the initial CT scan suggests bleeding or raises concern for a vascular abnormality, further imaging such as CTA or cerebral angiography may follow.
What happens if a brain aneurysm is found on a CT scan?
Finding a brain aneurysm does not automatically mean treatment is required.
A specialist will assess:
- Aneurysm size
- Location
- Shape and irregular features
- Whether it has ruptured
- Your age and overall health
- Family history
- Individual rupture risk
Depending on these factors, management may involve monitoring with follow-up imaging or minimally invasive endovascular treatment such as coiling, flow diversion or stent-assisted techniques where appropriate.
1. Do brain aneurysms show up in a CT scan?
A computed tomography scan (CT scan) is a two- or three-dimensional image of the brain and skull. Yes, most brain aneurysms will show up on a CT scan, whether intact or if it has burst, leaking blood into the brain.
2. If I am checking my brain, should I get a CT or an MRI scan?
A CT scan is the best and fastest choice for detecting a ruptured aneurysm and blood clots. A MRI can identify aneurysms that have not ruptured and does so in more detail.
3. What side effects can a CT scan on the brain have?
Although a CT scan is considered safe for most, there may be side effects due to the contrast dye that include:
- Headache
- Nausea
- Vomiting
- Warm flushing sensation
- Salty taste in the mouth
In the event of other symptoms, including the development of a rash, itching, swelling, pain, trouble breathing, or swelling at the IV site, these should be reported to your doctor.
4. Are CT scans of the brain for the first time dangerous?
A first-time CT scan is usually safe. One possible risk, beyond an allergic reaction to the dye, is the amount of radiation exposure, which is low although greater than that of a routine X-ray.
5. Does dust show up on a CT scan?
No, generally dust particles are too small and low-density to appear on a CT scan, especially when looking for a brain aneurysm.
6. How is a cerebral angiogram performed?
Another way to make a brain aneurysm diagnosis is through a cerebral angiogram for which the patient will lie on an X-ray table with their head held still. A catheter is inserted through the groin or neck, which is guided through x-ray technology to the right position.
A diagnostic dye is injected in through the catheter and x-rays are then taken as the dye moves through the blood vessels. Once completed, the catheter is removed, and the patient is monitored for a few hours following.
7. Can a brain aneurysm be diagnosed before it ruptures?
The best time to treat a brain aneurysm is before it ruptures. However, most aneurysms that have not ruptured do not cause symptoms and therefore are not tested for. For those who have a family history of brain aneurysms, Dr. Manish Taneja recommends a screening test even if you are free of symptoms.
8. What are the chances of an aneurysm rupturing?
The chances of having an aneurysm rupture are low, but it does happen. Women are more likely to have a brain aneurysm and women over the age of 55 are more apt to experience a rupture.
9. How to decrease the chance of brain aneurysm rupturing?
The best way to decrease the chances of a brain aneurysm from rupturing are those issues which you can help manage, including:
- Quit smoking
- Control high blood pressure
- Eat a healthy diet
- Get regular exercise
- Avoid excessive use of alcohol and non-prescribed drugs
Additionally, if you have been diagnosed with a brain aneurysm, routine office visits and screenings are recommended.
10. Are brain aneurysms present at birth or develop later in life?
Some aneurysms may be present at birth, but they can occur at a later age. Aneurysms are most often diagnosed between the ages of 35-60.
You might also be interested in our part 2 of our Brain Aneurysm CT Scan: Frequently Asked Questions.
When to See a Brain Aneurysm Specialist
If imaging suggests a possible brain aneurysm or another vascular abnormality, specialist assessment helps ensure an accurate diagnosis and personalised treatment plan.
Consider seeing a neurointerventional or cerebrovascular specialist if you:
- Have a brain aneurysm identified on CT, CTA, MRI or MRA
- Have experienced a sudden severe headache or stroke-like symptoms
- Have abnormal findings on emergency brain imaging
- Have a family history of brain aneurysms or subarachnoid haemorrhage
- Have been advised to undergo cerebral angiography for further assessment
- Would like a second opinion regarding aneurysm monitoring or treatment
- Have questions about minimally invasive treatment options
During your consultation, your specialist will review your imaging, discuss your individual risk factors and explain whether observation, repeat imaging or treatment is the most appropriate next step. Decisions are based on the complete clinical picture rather than imaging findings alone.
Seek emergency medical attention immediately if you develop a sudden severe headache, facial drooping, weakness, difficulty speaking, seizures, confusion, loss of consciousness or sudden vision changes. These symptoms may indicate a ruptured brain aneurysm or stroke and require urgent treatment.
Brain Aneurysm Care and Treatment at Our Specialized Brain Aneurysm Clinic in Singapore
In Singapore, if you or a loved one has reason to suspect a brain aneurysm contact the Supreme Vascular and Interventional Clinic right away and schedule a consultation with our brain aneurysm specialist, Dr. Manish Taneja. If you are having brain aneurysm rupture symptoms of a rupture such as seizures, severe light sensitivity, neck stiffness, nausea, vomiting, or a loss of consciousness, call 9-9-5.
Brain Aneurysm Resources
Discover brain aneurysm resources that go beyond the basics designed for patients. Understand the meaning of a brain aneurysm condition, the causes, symptoms, signs, and more. Connect with your brain health.
Put Brain Aneurysm on Your Health Radar
Did you experience the worst headache of your life? Thoughts could be racing through your mind. A brain aneurysm is a weak spot in a blood vessel in the brain that can change over time. The key concern is when an aneurysm ruptures, which can disrupt blood flow, affect brain tissue, and lead to serious brain damage. Controllable conditions like high blood pressure can increase this risk and treatment options can depend on the condition. Surgical clipping is one option that prevents blood from entering the weakened area. In many cases, minimally invasive treatments can also be used to restore normal blood flow and reduce risk. We have created structured guides to help you explore each stage in more detail:
A simple (computed tomography) CT scan could be just what the doctor ordered and the first step in early detection and prevention of a brain aneurysm. Come in for an easy consultation with our brain aneurysm specialist in Singapore to be on your health radar.
Other Health Conditions
The Supreme Vascular and Interventional Clinic is your "go-to" facility for various neurointerventional / stroke conditions and treatments. To arrange an appointment with Dr. Manish Taneja, our brain aneurysm specialist, contact us. You can also call us at (+65) 6904 8084 for a consultation.