You need patient consent for a case report because informed consent is mandatory. Without patient consent, the publication of a case report can be rejected and may even damage the patient-doctor relationship or the author's professional credibility. It is also important to note that informed consent should not be taken lightly as it can have profound implications if not appropriately obtained. In fact, informed consent is required for any medical research involving human subjects, including publishing a case report. This helps ensure that all ethical considerations are taken into account when obtaining informed consent from patients before publishing their case reports.