How to Read Your MRI, CT Scan, or X-Ray Report

Radiology reports are written for physicians — but as a patient, understanding yours empowers you to ask better questions, participate in your care, and catch potential issues early. Here’s your complete plain-language guide.

The Scale of Radiology Errors

A landmark study published in Radiology found a major discrepancy rate of approximately 3–5% in radiological interpretations — meaning for every 100 scans reviewed by a second expert, 3–5 contain clinically significant errors. In cancer imaging, disagreement rates have been reported as high as 30%. Given that millions of scans are performed daily worldwide, the absolute number of patients affected is substantial.

1. Patient & Study Information

This header section contains your name, date of birth, the date the scan was performed, the referring physician’s name, and the clinical indication — the reason the scan was ordered. Always verify this information is correct. Errors in patient identification, though rare, do occur.

2. Technique

This section describes how the scan was performed — the type of MRI sequence used, whether contrast dye was administered, the slice thickness of CT images, or the projection angles of an X-Ray. While highly technical, this section matters because it establishes the quality and completeness of the imaging performed.

3. Findings

This is the largest and most clinically important section. The radiologist systematically describes everything visible on the scan — both normal and abnormal structures. Watch for these important terms:

Hypodense / Hypointense: Darker than surrounding tissue — may indicate fluid, fat, or air.
Hyperdense / Hyperintense: Brighter than surrounding tissue — may indicate blood, contrast, or calcium.
Mass / Lesion / Nodule: An abnormal area of tissue — may be benign or malignant.
Effusion: Fluid in a cavity — joint, pleural (lung), or pericardial (heart).
Atrophy: Shrinkage of an organ or tissue structure.
Edema: Swelling due to excess fluid.
Cannot exclude / Rule out: The radiologist sees something that might be significant but cannot confirm — this language always warrants follow-up.

Important: The “Findings” section lists observations — it does not yet provide diagnosis. A finding of “a 1.2 cm nodule in the right lower lobe” requires clinical correlation to determine its significance. This is precisely where radiology expertise matters most.

4. Impression / Conclusion

This is the most important part of the report for patients and referring physicians. The impression summarizes the significant findings and provides the radiologist’s diagnostic interpretation. It is typically structured as a numbered list of conclusions in order of clinical importance.

If the impression contains phrases like “clinical correlation is recommended,” “follow-up imaging in 3–6 months,” or “biopsy should be considered,” these are direct clinical recommendations that your physician should act upon.

5. Signature

The report is signed by the interpreting radiologist. Note their credentials and subspecialty — an MRI of the spine ideally should be interpreted by a musculoskeletal or neuroradiologist, not a general radiologist under production pressure.

When Your Report Is Unclear

If after reading your report you remain uncertain about a finding’s significance — or if your physician hasn’t fully explained it — a Radeterno expert review can provide a patient-friendly annotated report that maps every finding to a visual image and explains its clinical meaning in plain language.