Lycanthropy is a term commonly found in fiction, specifically stories relating to werewolves and wolf-men. However it is additionally a medical term, used to describe a mental illness where a person believes themselves to be changing into a wolf or wolf-like creature. The broader term for this is Zoanthropy. 

important sources: 

live science

The Buffalo Man

Man Transforming into a Wolf

CDC Rabies

Mayo Clinic Rabies

Mark Andrews

Zoanthropy Sources:

http://drwilliamdoverspike.com/files/how_to_understand_zoanthropy.pdf

https://jdc.jefferson.edu/cgi/viewcontent.cgi?referer=&httpsredir=1&article=1302&context=jeffjpsychiatry

https://www.scienceopen.com/document?vid=303959e5-89a3-44ac-baf8-be48fad08376

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7971710/

https://www.frontiersin.org/articles/10.3389/fpsyt.2021.718101/full#:~:text=In%20total%2C%2043%20cases%20of,found%20between%201970%20and%202020.

https://www.researchgate.net/publication/236930283_Clinical_zoanthropy

DMS

http://jaapl.org/content/42/3/369

https://www.webmd.com/mental-health/impostor-syndrome-capgras

https://pubmed.ncbi.nlm.nih.gov/34033319/#:~:text=Capgras%20syndrome%20(CS)%2C%20or,inanimate%20object%20or%20an%20animal.