Herniated Disc on MRI: What the Scan Shows and When It Is Recommended

A herniated disc is a displacement of part of an intervertebral disc beyond its normal anatomical position. Depending on its location and the degree of pressure on nerve structures, it may cause pain in the back, neck, arm, or leg, as well as numbness, tingling, and muscle weakness.

Magnetic resonance imaging provides a detailed assessment of the intervertebral discs, spinal cord, nerve roots, spinal canal, and surrounding soft tissues. For this reason, MRI is often recommended when a herniated disc in the cervical, thoracic, or lumbar spine is suspected.

In brief: MRI shows the location, direction, and size of a herniated disc and helps determine whether it is compressing a nerve root, the spinal cord, or other structures. However, the scan results should always be evaluated together with the patient’s symptoms and the findings of a medical examination.

What Is a Herniated Disc?

Intervertebral discs are located between adjacent vertebrae. They absorb shock and help maintain the mobility of the spine. Each disc consists of an outer fibrous ring and an inner gel-like nucleus pulposus.

Age-related changes, excessive strain, injury, or gradual wear can cause the disc to lose elasticity and change shape. Part of the disc may extend beyond its normal boundaries and, in some cases, come into contact with nearby nerve structures.

Which Disc Changes Can Be Described on MRI?

• Disc bulge — a broad displacement of the disc contour beyond the edges of the adjacent vertebral bodies.
• Disc protrusion — a localised disc displacement in which the base of the displaced portion remains relatively wide.
• Disc extrusion — a more pronounced displacement of disc material beyond the normal disc boundary.
• Disc sequestration — separation of a fragment of disc material from the main disc.

In everyday language, different types of disc displacement are often referred to as a herniated disc. In the MRI report, the radiologist uses more precise terminology and indicates the level, size, direction, and effect of the abnormality on the surrounding structures.

What Does a Herniated Disc Look Like on MRI?

During the examination, the radiologist evaluates more than the intervertebral disc itself. A spine MRI may show:

• the spinal level at which the herniated disc is located;
• its size and direction of extension;
• the condition of the nerve roots;
• narrowing of the spinal canal;
• compression of the spinal cord or cauda equina;
• the condition of the neural foramina;
• degenerative changes in the discs and joints;
• changes in the vertebral bodies and endplates;
• swelling, inflammatory changes, or other associated abnormalities.

The size of a herniated disc is important, but it is not the only factor that determines its clinical significance. A small protrusion located close to a nerve root may cause pronounced symptoms. At the same time, a larger herniated disc may cause little or no discomfort if it does not compress the nerve structures.

Which Part of the Spine Should Be Examined?

The examination area is selected according to the location of the pain, neurological symptoms, and the preliminary diagnosis.

Part of the spine	Possible symptoms	Recommended examination
Cervical spine	Pain in the neck, shoulder, or arm, numbness in the fingers, weakness in the arms	Cervical spine MRI
Thoracic spine	Pain between the shoulder blades, discomfort along the ribs, a feeling of tightness in the chest	Thoracic spine MRI
Lumbar spine	Lower back, buttock, or leg pain, numbness, tingling, or symptoms of sciatica	Lumbar spine MRI

If symptoms affect several areas or the doctor suspects abnormalities at different levels, an MRI of two spinal regions or a screening MRI of the entire spine may be recommended.

When May a Doctor Recommend MRI for a Suspected Herniated Disc?

A spine MRI may be recommended if:

• the pain does not improve or repeatedly returns over a prolonged period;
• the pain radiates to the arm, buttock, or leg;
• numbness, tingling, or a “pins and needles” sensation develops;
• weakness appears in an arm or leg;
• sensation is reduced in a particular area of the body;
• symptoms continue to worsen despite prescribed treatment;
• preparation is required for an injection, surgery, or another procedure;
• the condition of the spine needs to be assessed after surgery;
• spinal canal stenosis or spinal cord involvement is suspected.

When May MRI Not Be Necessary for Back Pain?

Not every episode of back pain requires an immediate MRI scan. In cases of acute uncomplicated pain without neurological impairment or warning signs, the doctor may initially recommend a clinical examination, observation, and conservative treatment.

MRI is most appropriate when the result may affect further management, help clarify the diagnosis, explain progressive symptoms, or assist in selecting a treatment method.

Which Symptoms Require Urgent Medical Attention?

Do not delay seeking medical attention if back pain is accompanied by:

• sudden or rapidly increasing weakness in the limbs;
• difficulty urinating or loss of bowel control;
• numbness in the perineal or saddle area;
• difficulty walking or impaired coordination;
• severe pain following an injury;
• high fever and a deterioration in general health;
• pain associated with cancer or significant unexplained weight loss.

These symptoms may require an urgent medical examination and immediate diagnostic testing.

Is Contrast Needed for a Herniated Disc MRI?

For the initial detection of a herniated disc, MRI is usually performed without contrast enhancement. A standard scan is generally sufficient to assess the intervertebral discs, nerve roots, and spinal canal.

A doctor may recommend contrast-enhanced MRI when it is necessary to:

• assess changes after spinal surgery;
• distinguish postoperative scar tissue from a recurrent herniated disc;
• clarify the nature of a mass or tumour;
• detect an inflammatory or infectious process;
• evaluate particular changes in the spinal cord or soft tissues in greater detail.

The decision to use a contrast agent is made by the doctor based on the purpose of the examination, previous results, and the patient’s overall condition.

How to Prepare for a Spine MRI

Special preparation is usually not required for a spine MRI without contrast. Before the examination, patients should:

• remove jewellery, watches, and other metal objects;
• inform the medical staff about implants, prostheses, clips, a pacemaker, or other implanted devices;
• bring previous scans and medical reports, if available;
• inform the staff in advance about pregnancy or claustrophobia;
• clarify the preparation requirements if contrast administration is planned.

It is important to remain still during the examination. The duration of the scan depends on the selected part of the spine and the examination protocol.

What Should You Do After Receiving the Results?

An MRI report alone does not determine whether surgery is necessary and does not replace a medical consultation. The findings should be compared with the location of the pain, sensation, muscle strength, reflexes, and other examination results.

After the scan, the results can be reviewed by a neurologist, neurosurgeon, orthopaedic trauma specialist, or the doctor who referred the patient for diagnostic imaging. Treatment depends not only on the size of the herniated disc but also on the severity of the symptoms and the degree of nerve compression.

Spine MRI in Kyiv near Shuliavska

At HBMedical Medical Centre, patients can undergo MRI of the cervical, thoracic, and lumbar spine in Kyiv. Examinations are performed using a 1.5 Tesla Siemens Magnetom Sempra MRI scanner, which provides detailed images of the intervertebral discs, nerve roots, spinal cord, and surrounding tissues.

The medical centre is located at 3 Oleksandra Dovzhenka Street, Kyiv, near Shuliavska metro station. Current prices and available examinations can be found on the MRI in Kyiv page.

Book a spine MRI at HBMedical to investigate the cause of your symptoms and receive a detailed report from a radiologist.

Frequently Asked Questions

Can a herniated disc be seen on MRI?

Yes. MRI can show the level, direction, and size of a herniated disc and assess its effect on the nerve roots, spinal cord, and spinal canal.

Does a herniated disc seen on MRI always cause pain?

No. Some disc bulges and degenerative changes may not cause any symptoms. For this reason, MRI findings should always be evaluated together with the patient’s complaints and physical examination results.

Which is better for a suspected herniated disc: MRI or CT?

MRI is generally more informative for examining the intervertebral discs, nerve roots, and spinal cord. CT provides more detailed images of bone structures and may be used when MRI is contraindicated.

Is contrast required to detect a herniated disc?

In most cases, a herniated disc can be diagnosed without contrast. Contrast enhancement may be required after surgery or when a tumour, inflammatory condition, or infection is suspected.

Can I have an MRI without a referral?

Booking requirements should be confirmed with the medical centre. However, a prior medical consultation can help determine the correct spinal region and the most appropriate examination protocol.

This material is provided for informational purposes and does not replace a medical consultation.