How to Write a Medical Case Report (CARE Guidelines)
The structure clinicians and MD/MS students use to write publishable case reports, CARE checklist, patient timeline, consent and clinical takeaway.
A case report documents a single patient's presentation, management and outcome, usually because something about it is instructive, a rare condition, an unexpected response, a diagnostic lesson. For MD and MS students it is often the first publishable writing, and the CARE guidelines provide the accepted structure.
Title and Abstract
The title should include the phrase "a case report" and the key clinical feature. The structured abstract summarises the introduction, the case (presentation, diagnosis, intervention, outcome) and the conclusion, enough for a reader to grasp the lesson before reading further.
Introduction
Briefly establish why this case matters: the clinical background and what makes this presentation worth reporting. Two or three referenced sentences situating the case in existing knowledge are enough.
Case Presentation
The core. Present chronologically: patient demographics (de-identified), presenting complaint and history, relevant examination findings, investigations and results, diagnosis, the intervention, and follow-up with outcomes. A timeline, a CARE requirement, helps readers follow the sequence. Include only clinically relevant detail, and never anything that could identify the patient.
Discussion
Interpret the case against the literature. How does it compare with previously reported cases? What is the proposed mechanism? What diagnostic or management lesson does it teach? Acknowledge limitations, a single case cannot establish causation. This is the section that demonstrates clinical reasoning.
Conclusion and Patient Perspective
State the clinical takeaway concisely, the "so what" for practice. CARE also encourages a patient perspective where appropriate, capturing the experience in the patient's own terms.
Consent, Non-Negotiable
Informed patient consent for publication is mandatory and must be stated explicitly. Journals require it, ethics demands it, and its absence will stop publication regardless of the case's interest.
Referencing
Medical writing overwhelmingly uses Vancouver style, numbered citations in order of appearance. Keep the reference list current and verify every entry.
Checklist
- Does the report follow the CARE structure with a timeline?
- Is the patient fully de-identified?
- Is informed consent for publication stated?
- Does the discussion teach a clear clinical lesson?
- Have I checked whether my institution requires a formal consent form for publication?
- Does the timeline figure show the sequence at a glance?
The CARE Structure, Item by Item
CARE stands for CAse REport. It is a reporting guideline, indexed by the EQUATOR Network alongside CONSORT and STROBE, and most journals that publish case reports now expect the checklist to be followed.
| Section | What it must contain |
|---|---|
| Title | The words "case report", plus the phenomenon of greatest interest |
| Keywords | Two to five, including the condition and the lesson |
| Abstract | Background, case summary, conclusion. Often structured |
| Introduction | Brief context and why this case merits reporting |
| Patient information | De-identified demographics, main symptoms, relevant history |
| Clinical findings | Examination findings, described rather than interpreted |
| Timeline | The distinctive CARE element. Dated sequence of episode and outcomes |
| Diagnostic assessment | Methods, challenges, differential diagnosis, prognosis |
| Therapeutic intervention | Types, administration, changes, with dosing where relevant |
| Follow-up and outcomes | Clinician-assessed and patient-assessed outcomes, adverse events |
| Discussion | Strengths, limitations, relevant literature, rationale for conclusions |
| Patient perspective | The patient's own account, where obtainable |
| Informed consent | A statement that consent for publication was obtained |
Two of these are routinely omitted and both are noticed. The patient perspective is unique to CARE and gives a case report something no cohort study has. The timeline turns a chronological narrative into something a reader can absorb in seconds.
Building the Timeline
The timeline can be a figure or a table. Either way it should carry the dates or intervals, the presenting events, the key investigations with their results, the interventions and the outcomes. Use relative dating such as day 0, day 4, month 3, since absolute dates are identifying information.
A useful test: someone reading only the timeline should be able to state what happened, in order, and roughly when. If they cannot, the timeline is a decorated list rather than a summary.
De-identification, Properly
Removing the name is the beginning, not the end. In a rare condition at a named centre, a patient can be identifiable from a combination of age, ethnicity, occupation and date, none of which identifies them alone.
- Dates: use intervals from presentation rather than calendar dates.
- Age: band it where the exact figure is not clinically load-bearing, though be careful, since age is often material in paediatrics and geriatrics.
- Location and institution: avoid naming the hospital where the case is rare.
- Images: crop and mask. Radiographs can carry embedded identifiers in the file metadata, so check the DICOM header, not just the picture.
- Rare features: an unusual occupation or a distinctive comorbidity can identify. Generalise where it does not change the clinical lesson.
Note that de-identification does not remove the consent requirement. Journals following ICMJE recommendations expect written informed consent for publication regardless, and many require the signed form to be available on request.
The Discussion Carries the Value
A case report without a discussion is a clinical note. The discussion is where the single patient becomes useful to a reader who will never meet them, and it does three things.
First, it places the case against the existing literature. What has been reported before, how does this case resemble or differ from it, and what does the difference suggest? This requires an actual search, and saying what you searched and found is stronger than an unsupported claim of novelty.
Second, it reasons about mechanism. Why might this have happened? A plausible explanation, offered tentatively and grounded in physiology or pharmacology, is what turns an observation into a hypothesis worth testing.
Third, it states the limitations honestly. One patient cannot establish causation, confounding cannot be excluded, and follow-up may be short. Naming these does not weaken the report. It shows you understand what a case report can and cannot support, which is exactly the judgement a reviewer is assessing.
What Makes a Case Worth Reporting
| Reportable | Usually not |
|---|---|
| An unexpected association between conditions | A textbook presentation managed conventionally |
| An unreported adverse effect of an established treatment | A case that is merely uncommon locally |
| A novel diagnostic or therapeutic approach | A case with incomplete follow-up and no outcome |
| A presentation that challenges current understanding | A well-documented rarity already reported many times |
| An error or near miss with a transferable lesson | An interesting case with no generalisable lesson |
The test is transferability. What should a reader do differently having read this? If you cannot answer, the case may be memorable without being publishable.
Common Mistakes and Fixes
| Mistake | Fix |
|---|---|
| Narrative with no timeline | Add the timeline figure. It is the defining CARE element |
| Discussion that restates the case | Place the case against the literature and state the lesson |
| Consent not mentioned | Include an explicit statement. Its absence blocks publication |
| Interpretation mixed into clinical findings | Findings describe. Assessment interprets |
| Every investigation reported | Include what bears on the diagnosis or the lesson |
| Generalising from one patient | A case report generates hypotheses. It does not establish effectiveness |
| Patient perspective omitted | Include it where obtainable. It is a CARE item |
Where Ethical Support Fits
Case reports are frequently written by junior clinicians with a supervising consultant, and that supervision is expected rather than optional. Medical librarians will help you check whether the case has been reported before, which is a question you should answer before writing. Language editing is common and accepted in medical publishing.
What must be yours is the clinical account and the interpretation. Authorship also carries a formal meaning here: the ICMJE criteria require substantial contribution, drafting or critical revision, final approval, and accountability. Adding a senior name that meets none of these is gift authorship, which journals treat as misconduct.
Frequently Asked Questions
Do I need ethics approval for a case report?
Usually not, since a single retrospective case is not normally research. You do need informed consent for publication, and local policies vary, so confirm with your governance team rather than assuming.
What if the patient has died or cannot be contacted?
Journals differ. Many accept consent from next of kin, and some will consider publication without consent where the case is fully de-identified and the public benefit is clear. Ask the editor before submitting.
How long should a case report be?
Commonly 1,000 to 2,500 words with 15 to 30 references, though limits vary widely. Check the target journal's instructions before drafting.
Can I report a case series instead?
Yes, and a series of similar cases is often more useful. Note that reporting expectations shift as numbers rise, and a large series may need a different guideline.
How do I know the case has not been reported already?
Search the literature properly before writing, and say what you found. "To our knowledge this is the first report of..." should follow a documented search, not an assumption.
Which reference style do case reports use?
Vancouver in most of medicine, with numbered citations in order of appearance. The target journal's instructions govern.
Your Next Step Today
Download the CARE checklist and tick off which items your draft already contains. The gaps are almost always the timeline, the patient perspective and the consent statement, and all three are quick to add.
Trusted Sources
- CARE Case Report Guidelines, checklist and writing templates. Accessed 11 August 2026.
- EQUATOR Network, The CARE Guidelines. Accessed 11 August 2026.
- ICMJE Recommendations, on authorship, consent and patient privacy. Accessed 11 August 2026.
- EQUATOR Network, the full index of reporting guidelines. Accessed 11 August 2026.
This is general study and writing guidance, not clinical or legal advice. Consent and governance requirements are set by your institution and target journal, so follow theirs.
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