Common Terms in MRI Reports

What It Is

A radiology report is a written description of the images. Radiologists describe what they see using standardized words for brightness, size, shape, location, and change over time. Many of these words sound alarming but are simply descriptive.

For example, an MRI "signal" refers to how bright a tissue appears on a particular sequence. "Hyperintense" means brighter than the reference tissue and "hypointense" means darker. Many normal and abnormal tissues can look bright or dark depending on the sequence, so these words alone do not indicate a specific condition.

The "Impression" section summarizes what the radiologist considers most important, sometimes with suggestions for follow-up. This guide is a general glossary to help with reading the language; it cannot tell anyone what their own report means.

Common Terminology

Unremarkable

Nothing notable or abnormal was seen in that structure.

Hyperintense / hypointense

Brighter or darker than the comparison tissue on a particular MRI sequence.

Enhancement

An area became brighter after contrast was given, often reflecting blood supply or inflammation.

Incidental finding

Something seen on the scan that is unrelated to the reason the scan was ordered; sometimes called an "incidentaloma."

Degenerative changes

Wear-and-tear changes, commonly seen in the spine and joints, that become more common with age.

Lesion

A general term for any area that looks different from surrounding tissue; it does not mean cancer by itself.

Edema

Extra fluid in a tissue, which often appears bright on certain fluid-sensitive sequences.

Clinical correlation recommended

A phrase asking the ordering clinician to consider the finding together with symptoms, exam, and other tests.

Why the Test Is Done

Understanding common report terms can help people follow along when results are discussed. These terms appear because:

• Radiologists need precise, standardized language to communicate with other clinicians.
• Reports are now often available to patients through online portals, sometimes before a clinician has reviewed them.
• Many findings must be described carefully without assuming a diagnosis.
• Comparison with prior scans requires consistent wording to describe change.
• Recommendations for follow-up imaging are often written using standardized phrases.

What the Results Generally Describe

Common groups of terms found in MRI reports include:

• Brightness terms: hyperintense, hypointense, isointense, and "signal abnormality."
• Contrast terms: enhancing, non-enhancing, rim enhancement, and "post-contrast."
• Size and shape terms: measurements in millimeters or centimeters, well-circumscribed, ill-defined, and focal or diffuse.
• Change terms: new, stable, unchanged, increased, decreased, and "interval change."
• Spine and joint terms: disc bulge, disc protrusion, stenosis, tear, effusion, and degenerative changes.
• Certainty terms: "likely," "possibly," "cannot be excluded," and "differential diagnosis."
• The significance of any of these words depends on context and is explained by the clinician.

How the Test Is Done

A typical MRI report is organized into sections such as:

• Clinical history or indication: the reason the scan was ordered.
• Technique: the body part, sequences used, and whether contrast was given.
• Comparison: any earlier imaging used for reference.
• Findings: a detailed, structure-by-structure description.
• Impression or conclusion: a summary of the most important findings and any recommendations.

Preparation and What to Expect

General tips that may help when reading an MRI report:

• Starting with the Impression section can give an overview of the main points.
• Words like "mild," "small," and "stable" are often used for findings of lower concern, but meaning depends on context.
• Many findings, such as small cysts or age-related changes, are common in people without symptoms.
• Unfamiliar terms can be written down to ask about during a results discussion.
• Searching individual words online without context can be misleading.

When Results Are Discussed With a Clinician

MRI reports are generally reviewed with the ordering clinician. Topics often discussed include:

• Which findings are considered important and which are incidental or expected.
• How the findings relate to the person's symptoms and history.
• What any recommended follow-up imaging or tests would involve.
• What specific terms in the report mean in plain language.
• Whether a specialist referral is being considered.

Questions to Ask a Healthcare Professional

General questions people often find useful to bring to an appointment:

• Which findings in this report are most important?
• Are any of these findings incidental or common for someone my age?
• What does this specific term mean in plain language?
• Does the report recommend any follow-up?
• How do these results compare with earlier scans?
• Can a copy of the images and report be provided?

Sources

This guide was written in plain language from the following authoritative references.

1. MRI Scans — MedlinePlus (U.S. National Library of Medicine)
2. Magnetic Resonance Imaging (MRI) - Body — RadiologyInfo.org (RSNA and ACR)
3. Diagnostic Imaging — MedlinePlus (U.S. National Library of Medicine)

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