New weakness, speech trouble, vision loss, or sudden severe imbalance can be a stroke. Call 911 immediately, even if symptoms improve.
Narrowing in the brain's arteries
Intracranial stenosis means that an artery inside the skull has become narrower. When plaque is responsible, it is called intracranial atherosclerotic disease. Narrowing may reduce blood flow or contribute to clots that block smaller branches.
Not every narrowed artery is caused by plaque. Conditions such as moyamoya disease, inflammation, or an artery-wall injury may require a different evaluation and treatment approach.
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How it relates to stroke and TIA
Symptoms can include sudden weakness or numbness, difficulty speaking, vision changes, or loss of balance. Some stenoses are discovered during a stroke or TIA workup; others are found incidentally. The key question is whether the artery is responsible for your symptoms.
Your specialist reviews brain imaging, vessel imaging, the pattern of symptoms, and other possible stroke causes. A prevention plan is most useful when it addresses the mechanism of the event.
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Advanced imaging with a purpose
CTA and MRA can identify narrowing. MRI helps assess any injury to brain tissue. In selected cases, a cerebral angiogram provides more detailed views of the artery and the alternate pathways that carry blood around a narrowed segment.
An angiogram may be considered when noninvasive imaging leaves a meaningful question unanswered or when an intervention is being evaluated. The decision weighs the expected benefit of the information against the risks of the catheter procedure.
Medical prevention comes first
For symptomatic intracranial atherosclerosis, intensive medical management is the usual first approach. This includes prescribed antiplatelet therapy, cholesterol reduction, blood pressure and diabetes management, avoiding tobacco, and a sustainable activity plan. Some patients receive two antiplatelet medicines for a limited period under specialist supervision.
Intracranial stenting is not routine first-line treatment. If symptoms recur despite a well-established medical plan, a specialist may reassess the diagnosis, blood flow, and medication response. Any consideration of angioplasty or stenting requires careful selection and discussion of procedural risk and uncertainty of benefit.
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What to bring and what to ask
Bring your scan images and reports, hospital discharge summary, full medication list, and home blood pressure readings if available. Write down what happened during each episode, how long it lasted, and when it occurred.
Useful questions include: Is this narrowing caused by plaque? Did it cause my symptoms? What are my personal prevention targets? Would another scan change treatment? What should I do if symptoms recur? Never adjust blood pressure or antiplatelet medicines on your own.
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Common questions
Would a stent be a quicker fix than medicines?
A brain-artery stent carries its own stroke and bleeding risks. Current guidance favors intensive medical prevention as the initial treatment for symptomatic atherosclerotic narrowing.
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Do I need repeated catheter angiograms?
Not necessarily. Follow-up imaging is selected for your diagnosis and clinical question. Ask which test is needed, when, and how its result could change your care.
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Is an angiogram a treatment for stenosis?
A diagnostic angiogram creates detailed images. Angioplasty or stenting is a separate treatment decision with its own consent, preparation, risks, and follow-up.
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Your next step
Sources & further reading
This guide explains general care options. Your treating team will recommend an evaluation and treatment plan for your individual situation.