Case series, which refers to a collection of medical cases used for research and study, can also be called a case report series, case study series, or case review series. Other synonyms include case compilation, clinical series, patient series, patient portfolio, or disease summary. These terms are commonly used in medical and healthcare fields to describe the same type of research methodology. Some authors may also refer to it as a clinical experience report or clinical observation study. Whatever the name used, the purpose of a case series is to analyze complex medical cases, identify commonalities, and provide valuable insights into various diseases or medical conditions.