IMAGING
Magnetic Resonance Imaging (MRI)
Advanced imaging that uses magnetic fields to evaluate selected neurologic, spinal and soft-tissue concerns.
THE SHORT VERSION
Testing helps answer a clinical question.
Magnetic resonance imaging creates detailed images using magnetic fields and radio waves rather than ionizing X-rays. It is often selected when the clinical question involves the brain, spinal cord or selected soft tissues.
What is this test?
Magnetic resonance imaging creates detailed images using magnetic fields and radio waves rather than ionizing X-rays. It is often selected when the clinical question involves the brain, spinal cord or selected soft tissues.
MRI provides detailed images of selected soft tissues and is often considered for particular brain or spinal questions. It is not automatically the best study for every painful or weak animal. A neurologic examination helps identify the region and clinical question before imaging. The patient generally needs a carefully planned procedure with still positioning and appropriate monitoring. MRI can reveal structural changes, but the cause may require additional tests. Ask how findings would alter treatment and what preparation, recovery, and aftercare the procedure requires.
What information can it provide?
- Brain imaging can help investigate selected seizure, balance or neurologic concerns.
- Spinal imaging may assess the spinal cord, discs and surrounding structures.
- Specialized sequences provide different information about tissue and inflammation.
Imaging provides information about location, size, shape, and structural changes. Radiographs and ultrasound often answer different questions, so one does not simply replace the other. Images may reveal a complication or guide sampling without establishing the exact microscopic cause. Some procedures require sedation or anesthesia to obtain accurate images safely. Ask what the proposed study is expected to clarify and how its possible results would influence treatment, further testing, or referral.
A neurologic examination helps locate where a problem may be occurring, such as the brain, spinal cord, peripheral nerves, or balance system. The location then guides the choice of tests. Weakness caused by low blood sugar or another body-wide problem can resemble a primary neurologic disorder, so blood testing may be important even when movement is the main concern. Imaging can provide structural information, but it is selected in the context of the examination rather than ordered identically for every animal.
When might your veterinarian recommend it?
- Investigate concerning neurologic deficits, persistent seizures or spinal pain when recommended.
- Clarify selected soft-tissue abnormalities that may not be well defined by computed tomography.
- Support referral or surgical decision-making when imaging would change management.
What can owners do before the visit?
- Most veterinary magnetic resonance studies require anesthesia because the patient must remain still.
- Ask about fasting, preanesthetic testing and referral arrangements.
- Bring prior neurologic examination findings and all previous imaging.
Ask the team whether the planned study requires fasting, sedation, anesthesia, contrast material, or changes to the usual medication schedule. Requirements depend on the patient, species, and procedure; do not withhold food or medication by copying instructions from another visit. Bring previous results and the current treatment list so that findings can be compared. After a sedated or anesthetized study, obtain written recovery and feeding instructions and a contact plan for unexpected problems.
What can this test not tell you by itself?
- Anesthesia, cost, availability and the animal’s stability can influence whether the study is appropriate.
- Imaging findings do not always identify the exact cause without additional tests.
- Magnetic resonance imaging is not a routine screening test for healthy animals.
A pathologist can examine how cells are arranged within a tissue sample, not only how individual cells look. This can help distinguish different diseases and sometimes provide information about margins or expected behavior. The usefulness of the answer depends on sampling the right area and preserving the specimen correctly. Biopsy results may need to be combined with imaging or other tests to assess the whole animal. Ask how long results are expected to take and what care is needed while waiting.
Do not change medication, interpret an abnormal number as a diagnosis or delay urgent treatment without direction from your veterinary team.
Useful questions for your appointment
- What neurologic or soft-tissue question are we trying to answer?
- Does my animal need stabilization before imaging?
- How might the result change treatment, prognosis or referral?