Several advances in surgery originated from observations made by medical students during their training. Although students are usually viewed primarily as learners, their position at the intersection of scientific study and patient care gave a handful a chance to have significant impact. Jean-François Calot described the hepatocystic triangle in his doctoral thesis, establishing an anatomical principle that remains central to safe cholecystectomy. Harvey Cushing and Ernest Amory Codman developed the anesthesia record, a chart that tracks vital signs during surgery and became the foundation of modern perioperative monitoring. Jay McLean identified anticoagulant substances that led to the discovery of heparin, enabling the development of vascular and cardiac surgery. After reasoning that platelets were destroyed in the spleen, Paul Kaznelson proposed splenectomy as treatment for immune thrombocytopenic purpura. Charles Best's observation that ligation of the pancreatic duct in dogs caused atrophy of the exocrine pancreas while preserving the islets led to the isolation of insulin, one of the most important therapeutic discoveries in medicine. Seeking a more efficient method of blood transfusion, Michael DeBakey designed the roller pump, a device that later became essential to cardiopulmonary bypass. As a medical student at Johns Hopkins, David C. Sabiston Jr participated in early work with Mark Ravitch exploring restorative operations for ulcerative colitis. Thomas Fogarty conceived the balloon embolectomy catheter after seeing the difficulty of removing arterial emboli. These episodes illustrate how curiosity and careful observation during medical education can produce insights that shape surgical practice for decades.
Nakayama et al. (2026) studied this question.