This chapter discusses eponymous syndromes, including Alice in Wonderland syndrome, Arnold–Chiari malformation, Baker’s cyst, Barrett’s oesophagus, Bazin’s disease, Behçet’s disease, Berger’s disease, Bickerstaff’s brainstem encephalitis, Brown-Séquard syndrome, Brugada syndrome, Budd–Chiari syndrome, Buerger’s disease, Caplan’s syndrome, Charcot–Marie–Tooth syndrome, Churg–Strauss syndrome, Creutzfeldt–Jakob disease (CJD), Crigler–Najjar syndrome, Devic’s syndrome, Dressler’s syndrome, Dubin–Johnson syndrome, Dupuytren’s contracture, Ekbom’s syndrome, Fabry disease, Fanconi anaemia, Felty’s syndrome, Fitz-Hugh–Curtis syndrome, Foster Kennedy syndrome, Friedreich’s ataxia, Froin’s syndrome, Gardner’s syndrome, Gélineau’s syndrome, Gerstmann’s syndrome, Gilbert’s syndrome, Gilles de la Tourette syndrome, Goodpasture’s disease, Guillain–Barré syndrome, Henoch–Schönlein purpura (HSP), Horner’s syndrome, Huntington’s disease, Jervell and Lange-Nielsen syndrome, Kaposi’s sarcoma (KS), Klippel–Trénaunay syndrome, Korsakoff’s syndrome, Langerhans cell histiocytosis, Leriche’s syndrome, Löffler’s eosinophilic endocarditis, Löffler’s syndrome, Lown–Ganong–Levine syndrome, McArdle’s glycogen storage disease (type V), Mallory–Weiss tear, Marchiafava–Bignami syndrome, Marchiafava–Micheli syndrome, Marfan’s syndrome, Meckel’s diverticulum, Meigs’ syndrome, Ménétrier’s disease, Meyer–Betz syndrome, Mikulicz’s syndrome, Milroy disease, Münchausen’s syndrome, Ogilvie’s syndrome, Ortner’s cardiovocal syndrome, Osler–Weber–Rendu syndrome, Paget’s disease of the breast (PDB), Pancoast’s syndrome, Parinaud’s syndrome, Paroxysmal nocturnal haemoglobinuria, Peutz–Jeghers’ syndrome, Peyronie’s disease, Pott’s syndrome, Prinzmetal (variant) angina, Raynaud’s syndrome, Refsum disease, Romano–Ward syndrome, Rotor syndrome, Sister Mary Joseph nodule, Sjögren’s syndrome, Stevens–Johnson syndrome, Sturge–Weber syndrome (SWS), Takayasu’s arteritis, Tietze’s syndrome, Todd’s palsy, Vincent’s angina, Von Hippel–Lindau syndrome, Von Willebrand’s disease (VWD), Wallenberg’s lateral medullary syndrome, Waterhouse–Friderichsen’s (WhF) syndrome, Weber’s syndrome, Wegener’s granulomatosis, Wernicke’s encephalopathy, Whipple’s disease, Zellweger syndrome, Zollinger–Ellison syndrome.