CT angiography of the aorta finds swelling (aneurysm) and tears (dissection) of the body's main artery. Learn why it is urgent, how it works and who should be screened.
CT angiography of the aorta is a fast scan with contrast that shows the body's main artery from the chest to the groin. It is the main test for an aortic aneurysm (a bulge in the artery wall) and an aortic dissection (a tear), which can be life-threatening. Sudden severe chest or back pain needs emergency care.
What Is the Aorta and What Can Go Wrong?
The aorta carries blood from the heart to the whole body. High blood pressure, smoking, age, cholesterol deposits and inherited conditions can weaken its wall. An aneurysm is a bulge that can burst if it becomes large. A dissection is a tear in the inner layer that can reduce blood flow to organs. See heart attack warning signs since symptoms can overlap.
ConditionWhat CT angiography showsAortic aneurysmSize, shape and location of the bulgeAortic dissectionTear in the wall and true and false channelsAortic injury after accidentTear or bleedingNarrowing (coarctation)Site and length of narrowingAfter repair or stentLeaks, blockages and graft positionSymptoms and Emergency Signs
- Sudden severe, tearing pain in the chest or back
- Pain with fainting, sweating or breathlessness
- Unequal pulse or blood pressure in the two arms
- A pulsating lump in the belly with pain
These need emergency care, not a scheduled appointment.
Who May Need a Scan Without Symptoms?
Doctors advise screening or follow-up for people with a known aneurysm, a family history of aneurysm, certain inherited conditions such as Marfan syndrome, a bicuspid aortic valve, and men over 65 who have smoked (usually by ultrasound for the belly aorta). See CT scan for appendicitis for another urgent abdominal CT.
How the Scan Works
Contrast is injected quickly through a vein and the scan is timed when the aorta is bright. In emergencies, preparation is skipped. For planned scans, fast for 4 to 6 hours and carry a creatinine report. The scan takes seconds and the visit under an hour. Read CT scan with contrast.
Alternatives
Ultrasound can follow a belly aneurysm without radiation, and MR angiography can follow the aorta in people who need many scans. CT is faster and preferred in emergencies. See CT angiography vs MR angiography.
A Practical Example
Mukesh, 66, a long-time smoker with high blood pressure, has a routine ultrasound that shows a 5 cm bulge in the belly aorta. A CT angiography maps its exact size and shape, and his vascular surgeon plans a stent graft. Another patient with sudden tearing chest pain is taken straight to CT angiography, which shows a dissection and allows urgent treatment.
After the Scan and Next Steps
Take the report to a vascular or cardiac surgeon. Small aneurysms are watched with regular scans and treated with blood pressure control, quitting tobacco and cholesterol medicines. Large ones are repaired with open surgery or a stent graft. Avoid heavy straining if advised, take medicines regularly and attend all follow-up visits.
Questions to Ask Your Doctor
- What is the size of my aneurysm and how often should it be scanned?
- Do I need surgery or a stent graft?
- Which activities are safe?
- Should my family members be screened?
Common Mistakes to Avoid
- Waiting at home with sudden severe chest or back pain.
- Skipping blood pressure medicines.
- Continuing to smoke after the diagnosis.
Booking, Timing and Report
Book a morning slot if possible, since fasting is easier. Carry your doctor's prescription, previous heart and blood reports, a recent creatinine report and a medicine list. Allow 45 to 90 minutes at the centre. Reports are usually ready within 24 to 48 hours, because vessel images need careful review.
Frequently Asked Questions
What is an aortic aneurysm?
A bulge in the wall of the aorta.
What is aortic dissection?
A tear in the inner wall of the aorta, an emergency.
Is CT angiography the best test?
Yes, for emergencies and detailed mapping.
Do I need fasting?
In planned scans, 4 to 6 hours.
Is contrast safe?
Yes with kidney and allergy checks.
Can ultrasound check the aorta?
Yes, for the belly aorta.
Can aneurysms run in families?
Yes.
How often are small aneurysms scanned?
As your doctor advises, often every 6 to 12 months.
How soon is the report ready?
In emergencies, within minutes; otherwise within 24 hours.
Book Your Test at Ganesh Diagnostic
Ganesh Diagnostic & Imaging Centre in Rohini, Delhi offers this test with trained radiology staff and clear reports. You can book an appointment online, check our branches across Delhi NCR, contact us for current rates, or explore all our services. Reports can be downloaded online through our patient portal, so you do not need to make a second trip just to collect them.
This article is for general information only. It does not replace advice from your doctor. Always follow your doctor's instructions for your test.
Related Reading
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- CT Renal Angiography for Kidney Artery Disease
- Cardiac CT Before Valve and TAVI Procedures
- CT Coronary Angiography for Chest Pain
- CT Coronary Angiography vs Echo Test
