What Conditions Can a Brain MRI Detect? A Guide for Milwaukee Patients

Key Takeaways

• A brain MRI uses magnets and radio waves (no radiation) to produce detailed images of brain tissue, blood vessels, and surrounding structures.
• Brain MRI can help identify or rule out a wide range of conditions, including stroke, tumors, multiple sclerosis, aneurysms, infections, structural issues, and causes of memory or cognitive change.
• MRI and CT scans are not interchangeable. CT is often used in the emergency room because it is fast. MRI is usually chosen when more detail of soft tissue is needed.
• An MRI finding is a starting point, not the whole picture. Your physician uses the images alongside your history, exam, and other tests to make a diagnosis and plan next steps.
• Smart Scan Medical Imaging in the Milwaukee area (Franklin) offers brain MRI on a GE Voyager 1.5T wide-bore scanner, with every scan read by a board-certified, fellowship-trained neuroradiologist. Same-day and next-day appointments are available, and reports are typically returned to your referring provider within 24 to 48 hours, with faster turnaround available for urgent cases. Request an appointment.

Schedule Now

What Conditions Can a Brain MRI Detect?

A brain MRI can help detect a wide range of conditions by showing the structure of the brain, blood vessels, and surrounding tissue in detail. Common things physicians look for on a brain MRI include stroke, tumors, aneurysms, multiple sclerosis, and other causes of inflammation, infections, structural abnormalities, and changes associated with memory loss or cognitive concerns.

MRI uses powerful magnets and radio waves rather than ionizing radiation, according to Cleveland Clinic. That means it can be repeated when your physician feels it is appropriate, which matters for conditions that need follow-up imaging over time.

If your provider ordered a brain MRI, there is almost always a specific question they are trying to answer. The scan is a tool to help answer it.

A note on emergencies: This article focuses on scheduled, outpatient brain MRI. If you or someone near you is having sudden symptoms that could point to a stroke (sudden face drooping, arm weakness, speech difficulty, severe headache, loss of balance, vision changes) or a serious head injury, call 911 or go to the nearest emergency room. Emergency imaging happens at the hospital, not at an outpatient center. Smart Scan's role is the scheduled follow-up or evaluation your physician orders after the emergency phase is over.

What Neurological Conditions Are Commonly Found on Brain MRI?

The neurological conditions most commonly evaluated with brain MRI include stroke, brain tumors, multiple sclerosis, aneurysms, hydrocephalus, infections, and structural changes associated with headaches, seizures, or memory loss. Here is a plain-language summary of each.

• Stroke. MRI can show both current and past strokes, including small strokes that a CT scan might miss. Specific MRI techniques can show tissue that is actively at risk.
• Brain tumors. MRI is one of the most sensitive tools for detecting tumors in the brain, including primary tumors and those that have spread from elsewhere.
• Aneurysms and vascular abnormalities. With MR angiography (MRA), MRI can also show the blood vessels of the brain, including bulges or narrowing.
• Multiple sclerosis (MS). MRI is widely used to look for MS lesions in the brain and spinal cord.
• Infections. Encephalitis, meningitis, and brain abscesses can leave patterns on MRI that help a physician narrow down the diagnosis.
• Structural abnormalities. Congenital or acquired changes in the shape or size of brain structures, such as hydrocephalus (fluid buildup) or Chiari malformation.
• Memory and cognitive concerns. MRI can help identify or rule out causes of memory change, including stroke, tumors, and structural changes consistent with Alzheimer's disease and related dementias.
• Seizures and epilepsy. MRI can help find scars, abnormal tissue, or other structural causes of seizures.
• Headaches with red flags. Sudden, severe, or changing headaches, or headaches with neurological symptoms, are often evaluated with MRI. A sudden 'worst headache of my life' or a headache with new neurological symptoms (weakness, confusion, vision changes) is an emergency and should be evaluated in the emergency room, not scheduled as outpatient imaging. 
• After head injury. MRI can help evaluate persistent symptoms after concussion or other head trauma. In the hours immediately after a significant head injury, especially with loss of consciousness, repeated vomiting, or worsening symptoms, call 911 or go to the emergency room; outpatient MRI is for later follow-up, not acute assessment.

Not every brain MRI will show something. A normal result is also useful information. It helps your physician narrow down what is going on by ruling things out.

How Does MRI Reveal Stroke, Tumors, and Structural Changes?

MRI reveals stroke, tumors, and structural changes by producing high-contrast images that distinguish between different types of tissue. The scanner uses magnetic fields and radio waves to make brain tissue respond in ways that show up as different shades on the final images, and radiologists are trained to read those differences.

In practice:

• For stroke, specific MRI sequences (such as diffusion-weighted imaging, or DWI) can show tissue affected by a very recent stroke even when a CT scan looks normal.
• For tumors, MRI can show the size, location, and some features of a growth, and contrast dye given through an IV can help highlight blood supply to a mass.
• For structural changes, MRI can show detail at the millimeter level, which helps when a physician is looking for small lesions, early atrophy, or developmental differences.

Every brain MRI at Smart Scan is interpreted by board-certified, fellowship-trained radiologists with subspecialty focus in neuroradiology. Subspecialty-trained neuroradiologists bring focused expertise to interpreting brain imaging, particularly when evaluating subtle or complex neurological findings. 

What Role Does MRI Play in Diagnosing MS and Nerve-Related Issues?

MRI plays a central role in diagnosing multiple sclerosis and other nerve-related issues because it is the most sensitive, non-invasive way to look at the brain and spinal cord for lesions. According to the National Multiple Sclerosis Society, MRI is a valuable tool for diagnosing MS and tracking the progression of the disease.

For MS specifically, MRI can:

• Show the lesions (also called plaques) in white matter that are the hallmark of the disease
• Help distinguish between older, stable lesions and newer, active ones (contrast dye is often used to highlight active disease)
• Support the McDonald criteria, which are the guidelines used to diagnose MS, by showing lesions distributed across different parts of the central nervous system and over time
• Monitor response to treatment during follow-up imaging

MRI is also used to evaluate other nerve-related issues, including trigeminal neuralgia, cranial nerve problems, and some causes of nerve pain in the face or head. For spinal cord issues or back pain affecting nerves, spine MRI is often the right test.

What Is the Difference Between Brain MRI and CT Scan?

The main differences between a brain MRI and a CT scan are the technology used and what each is best suited for. CT uses X-rays to produce fast, cross-sectional images, while MRI uses magnets and radio waves to produce more detailed images of soft tissue.

A plain-language summary:

CT is often the first test in the emergency room when quick answers are needed. MRI is usually chosen when more detail is needed, when a non-emergent evaluation is appropriate, or when a physician specifically wants to avoid radiation. At the Milwaukee location (Franklin), Smart Scan offers both brain MRI and CT scans, which makes it easier to coordinate when both are needed.

What Happens After a Condition Is Identified on Imaging?

After a condition is identified on imaging, your referring physician reviews the radiologist's report, discusses the findings with you, and uses that information to recommend next steps. Imaging is one input into a bigger decision. It is not the whole plan.

What happens next depends on what was found:

• What if the finding is minor or incidental? Your physician may simply monitor it with follow-up imaging in several months or a year.
• What if the finding is concerning but not an emergency? Your physician may refer you to a specialist, such as a neurologist, neurosurgeon, or oncologist, for a focused evaluation.
• What if the finding is urgent? For something like a new stroke or bleeding, your physician may send you to the emergency room or arrange immediate specialist care.
• What if the condition needs ongoing care? For conditions such as MS or a chronic structural issue, follow-up MRI may be part of your long-term plan.

Smart Scan does not make your diagnosis. Smart Scan sends the report to your physician, typically within 24 to 48 hours, with faster turnaround available for urgent cases. Your physician is the one who brings the imaging together with the rest of your care.

Where Can Milwaukee Patients Get a Brain MRI?

Milwaukee-area patients can get a brain MRI at Smart Scan Medical Imaging's Franklin location, which also offers CT and ultrasound for cases where more than one type of imaging is useful.

• The Franklin location uses a GE Voyager 1.5T wide-bore MRI scanner, which has a larger opening than older narrow-bore machines, helping reduce the feeling of being enclosed.
• Every brain MRI is read by board-certified, fellowship-trained radiologists with subspecialty focus in neuroradiology.
• Same-day and next-day appointments are available.
• Reports are typically returned to your referring provider within 24 to 48 hours, with faster turnaround available for urgent cases.
• Pricing is transparent, and most major insurance plans (including Medicare) are accepted. You can review pricing and payment options online.

Smart Scan also serves patients in Eau Claire, the Wausau area (Weston), and Madison (Middleton), with the same equipment and the same group of fellowship-trained radiologists at each site. 

Ready to Schedule a Brain MRI in the Milwaukee Area?

If your provider has recommended a brain MRI and you are looking for a comfortable outpatient option with subspecialty expertise, Smart Scan Medical Imaging is here to make the process straightforward.

Request an appointment at Smart Scan Medical Imaging in Franklin (Milwaukee area), Eau Claire, Wausau, or Madison, or call (855) 694-3300. Our team can also help answer questions about preparing for your scan and insurance coverage.

Frequently Asked Questions