Case reports are professional narratives that provide feedback on clinical practice guidelines and offer a framework for early signals of effectiveness, adverse events, and cost. They can be shared for medical, scientific, or educational purposes.  A case report is usually considered a kind of anecdotal evidence. Given their intrinsic methodological limitations, including lack of statistical sampling, case reports are placed at rock bottom of the hierarchy of clinical evidence, alongside case series. Nevertheless, case reports do have genuinely useful roles in medical research and evidence-based medicine. In medicine, a case report may be a detailed report of the symptoms, signs, diagnosis, treatment, and follow-up of a private patient. Case reports may contain a demographic profile of the patient but usually describe an unusual or novel occurrence. Some case reports also contain a literature review of other reported cases.