Retrospective simple means to look back. Retrospective diagnosis (retro-diagnosis or paleo-diagnosis or posthumous diagnosis) is the process of identifying an ancient illness with the modern name of illness using modern concepts.
Example: Adolf Hitler was diagnosed to have Parkinsonism after a retrospective study of 300 hr of film of Hitler, from 1919 to 1940.
The term is also used to denote the analysis of specimen for the diagnosis of illness of past that is already resolved or the illness of dead.
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