MRI examination – From symptoms to diagnosis and the right choice of examination

Do you have symptoms that do not go away or are difficult to explain? Then an MRI scan may be the next step. But it is not just about “doing an MRI” – which scan you choose affects what can be detected and how quickly you can reach a diagnosis.

From symptoms to diagnosis with MRI – which conditions can be detected and which MRI scan should you choose?

MRI stands for magnetic resonance imaging. The technique uses a strong magnetic field and radio waves to create cross-sectional images of the body. This makes MRI particularly good for assessing soft tissues – such as the brain, spinal cord, discs, ligaments, cartilage, muscles and several abdominal organs. An important advantage is that the scan does not use X-rays.

However, this does not mean that MRI is always the “best” first choice. In modern healthcare, imaging diagnostics are selected based on symptoms, risk level and clinical question. Evidence-based guidelines from radiology expert bodies emphasize that the right imaging should be done at the right time and that the choice must be adapted to the patient's situation.

When is MRI particularly valuable – and what conditions can it detect?

MRI is often very useful when the doctor needs to see details in tissues that are not as visible with regular X-rays. Examples of conditions where MRI often plays an important role are:

• Brain and nervous system

  • stroke at certain stages
  • inflammatory diseases such as MS
  • brain tumors
  • changes in the pituitary gland or auditory nerve
  • impact on the spinal cord or nerve roots

• Back and spine

  • herniated disc
  • spinal stenosis, i.e. narrowing of the spinal canal
  • nerve impact
  • suspected inflammation, tumor or impact on the spinal cord

• Joints and muscles

  • meniscus injuries
  • cruciate ligament injuries
  • cartilage and ligament injuries
  • muscle and tendon injuries
  • skeletal inflammation or stress reactions

• Abdomen and pelvis

  • liver changes
  • biliary tract and pancreas diseases
  • inflammatory bowel diseases in certain situations
  • gynecological issues
  • prostate diagnostics in selected patients

• Breast

  • additional examination in cases of high risk of breast cancer or in selected diagnostic situations, often together with mammography and ultrasound – not instead of them.

A common patient question is: “Can MRI detect cancer?” The answer is that MRI can show changes that indicate tumor disease and help map the spread, but the image must always be interpreted together with symptoms, blood tests, other imaging diagnostics and sometimes tissue samples. MRI does not always make the diagnosis alone.

Which MRI examination should be chosen based on symptoms?

The most important thing is not just to order “an MRI”, but to choose the right area and the right protocol. The same method can be used in different ways depending on the question you want to answer.

For neurological symptoms
MR brain is often chosen when there is suspicion of, for example, MS, tumors, certain inflammatory conditions or other neurological abnormalities. For back symptoms with radiation, loss of sensation or muscle weakness, MRI lumbar spine, MRI cervical spine, or MRI thoracic spine may instead be the right examination, depending on where the nerve damage is suspected. In the case of serious alarm symptoms such as new bladder dysfunction, bowel dysfunction or numbness in the lower abdomen together with severe back pain, rapid assessment is required for suspected cauda equina syndrome, where urgent investigation including imaging may be necessary.

In the case of long-term back pain
Not everyone with back pain needs an MRI. In the case of non-specific low back pain without neurological deficits or warning signs, MRI is often not the first choice. However, if the pain is combined with radiation, numbness, weakness or suspicion of a more serious underlying disease, MRI becomes significantly more relevant.

For knee or shoulder problems
MRI of the knee is often used when meniscus injury, cruciate ligament injury or cartilage injury is suspected. MR shoulder can be valuable when damage to the rotator cuff, labrum or other soft tissue structures is suspected. In some cases, MR arthrography is used, where contrast is injected into the joint to better show small injuries, for example in the labrum.

For abdominal symptoms
In cases of jaundice, unclear liver tests or suspected blockage of the biliary tract, MRCP may be the right method. MRCP is a special MRI examination that shows the liver, gallbladder, bile ducts, pancreas and pancreatic duct. In some situations, it can provide information similar to a more invasive examination, but without the same risks associated with the procedure.

For prostate problems or elevated PSA
Multiparametric MR prostate is now often used as part of the investigation for suspected prostate cancer. The aim is to better localize suspicious areas and determine whether a biopsy is needed and where it should be taken if so.

At high risk of breast cancer
MRI of the breast is primarily used as a complement in people with high risk, for example strong heredity or another clearly elevated risk profile. It is not generally used as the first screening method for everyone.

When is contrast media needed?

Many people wonder if MRI with contrast is dangerous. MRI is often done without contrast, but sometimes a gadolinium-based contrast media is needed to more clearly distinguish between healthy and diseased tissue, for example when investigating inflammation, tumors or vascularity. Whether contrast is to be given is an individual assessment. Kidney function, previous reactions and pregnancy can influence the choice. European guidelines from ESUR are updated continuously and include kidney-related risks, use during pregnancy and breastfeeding and gadolinium retention.

For the vast majority of people, MRI is a safe examination. However, safety is based on the healthcare system receiving correct information in advance. Strong magnetic fields mean that certain implants or metal objects may be unsuitable or require special monitoring. Examples include:

• pacemaker or defibrillator
• cochlear implant
• some older vascular clips
• metal splinters, especially in the eye
• other electronic or magnetically sensitive implants.

Another common question is: “I have claustrophobia – can I still have an MRI?” Yes, it is often possible. It helps to know how the examination is done, and sometimes sedatives can be used. Some patients may also need sedation or, more rarely, general anesthesia.

Common misunderstandings of MRI – this is important to know

MRI does not always find the cause of symptoms
A normal MRI does not rule out all diseases. Some problems are due to functional disorders, early disease changes or conditions that are better seen with another method or in blood tests.

MRI findings are not always dangerous
MRI is very sensitive and can detect so-called incidental findings – changes that are there but do not cause any symptoms. Therefore, the answer must always be interpreted in context.

More imaging is not always better
If the examination is performed too early, for the wrong indication or in the wrong anatomical area, you risk both unnecessary concern and findings that do not help the patient further. Evidence-based guidelines exist precisely to reduce unnecessary examinations and improve accuracy.

MRI does not replace clinical assessment
The best diagnosis occurs when symptoms, a medical examination, laboratory tests and imaging are weighed together. For example, dizziness, headache, abdominal pain or fatigue can be due to everything from benign to serious conditions – and sometimes blood tests are just as important a first step as imaging.

When should you seek care – and how is MRI related to sampling?

You should seek care if you have symptoms that:

• increase or do not improve
• affect function, sleep or work capacity
• are combined with neurological deficits, such as numbness or weakness.
• are followed by unexplained weight loss, fever or nocturnal pain.
• raise suspicion of biliary obstruction, such as jaundice.
• raise concern for a serious underlying disease.

For many patients, the investigation rarely begins with an MRI, but with a medical history, medical assessment and laboratory tests. Blood tests can provide important clues about inflammation, anemia, liver damage, kidney function, metabolism or hormonal abnormalities.

If you have recurring problems and wonder if further investigation is needed, it is wise to start with the most basic thing - finding out what your values ​​actually look like. If you have questions or want to talk to a doctor first, you are always welcome to call us, but in case of acute problems, you should always seek emergency care.