Serial Imaging in Veterinary Teleradiology: Comparing Prior Studies

A follow-up imaging request asks a question about change. What differs from the earlier study, what appears similar, and what can reasonably be compared? The current images and the earlier report play different roles in answering those questions. Organizing both gives the radiologist a clearer account of the comparison the clinician is requesting.

The ACVR describes veterinary radiologists as correlating imaging findings with examinations and tests and consulting with the referring veterinarian. [1] The workflow below applies that principle to follow-up studies. It is a suggested approach to organizing the record, not a schedule for repeat imaging or a claim that comparison alone establishes a diagnosis.

Define what the follow-up is intended to answer

State the reason for the new study and the earlier finding being reconsidered. A request might ask whether a previously described feature has changed, whether the current images help explain new signs, or whether findings from separate examinations can be considered together. Those are different questions. Tell the reader which one is central to the current clinical decision.

Do not treat “follow-up” as a complete indication. Include the interval history and explain why the clinician chose to acquire images now. The decision about whether and when to repeat imaging belongs to the treating veterinarian, informed by the individual patient. This article concerns preparation once a follow-up study has been chosen, rather than recommending a particular interval or number of examinations.

Distinguish prior images from prior reports

A previous report records the earlier interpretation. The original images are the material that can be reviewed alongside the current study. When both are available, identify both and make clear which examination each document belongs to. A report alone should not be described as if the radiologist has personally reviewed the source images from that earlier examination.

If the prior images cannot be obtained, say so in the request. Provide the report when available, but explain that the requested comparison is limited by the material supplied. That distinction also belongs in clinical discussion afterward: a comparison with an earlier report is not the same task as a direct review of both sets of images.

Make the study sequence unmistakable

Check the patient identifier, examination dates, body region, and modality for every study being supplied. Identify which examination is current and which is prior. If the examinations came from separate practices, note that fact and resolve identifier differences through the practice’s established record process. Avoid relying on filenames alone to describe the chronological relationship.

For several prior examinations, list the sequence and identify the comparison that matters most to the clinical question. More material does not remove the need for a clear request. Explain whether the clinician is asking about change since the last examination or a longer pattern across several visits. Preserve the complete record while helping the reader navigate its order.

Describe what happened between examinations

Document the change in clinical signs, relevant examination findings, treatments, and procedures between the earlier and current studies. Include dates where known. Keep the observed interval history separate from the clinician’s interpretation of why a change occurred. Imaging findings and clinical improvement may need to be considered together; neither should be silently substituted for the other.

A concise interval summary might distinguish three items: what the earlier study was performed to investigate, what happened afterward, and what question prompted the current study. This allows the radiologist to understand the comparison in clinical context. It also helps the next clinician read the record without assuming that all notes describe the same visit or the same stage of the patient’s care.

Read the comparison with its stated limitations

Different examinations may not offer equivalent views or coverage. Review any limitations described in the report before turning “changed” or “unchanged” into an independent clinical conclusion. If a feature cannot be assessed across the supplied examinations, preserve that distinction. Ask for clarification rather than translating a limited comparison into a stronger statement than the radiologist made.

The same care is needed when different modalities are involved. A radiograph, an Ultrasound examination, and a CT study are not interchangeable records. The clinician can ask how their findings relate, but should not assume that visibility on one examination establishes the same visibility on another. The report should be read as an interpretation of the available material, not a claim about information that was not acquired.

Close the loop in the clinical record

Keep the new interpretation attached to the current study, with the earlier study available through the record’s normal workflow. Document what the clinician understood the comparison to mean and what follow-up responsibilities were assigned. If clarification is needed, retain the relevant conversation with the case rather than leaving the explanation only in a personal note.

When discussing the result with a client or receiving practice, distinguish imaging comparison from the overall assessment of the patient. State what the radiologist described, identify any limits, and explain the treating veterinarian’s next step. The value of an organized comparison is a transparent account of change and uncertainty, not a promise that every follow-up study will provide a definitive answer.

Frequently asked questions