What is the history of Cholesteatoma?

I don't know how or when

Ernst kuster and Ernst Von bergmann developed an radical mastoidectomy to treat an ctoma

This IS a copy/paste, from PubMed (sorry, not something I focused on over the past 20 years since 1st DX):
In 1683, Duverney first described a temporal bone tumor probably corresponding to a cholesteatoma. Until 1838, when Müller coined the term cholesteatoma, nothing new about this condition appeared in medical publications. After 1838, three main theories about the pathogenesis of cholesteatoma were published. Virchow, in 1855, considered cholesteatoma to be a tumor arising from the metaplasia of mesenchymal cells to epidermal cells, growing then as tumoral cells. Gruber, Wendt, and von Troeltsch, in 1868, considered cholesteatoma to be the result of a metaplasia not of bone cells but of tympanic mucosa cells into a malpighian epithelium. Politzer, in 1869, assumed that cholesteatoma was a glandular neoplasm of middle ear mucosa. Bezold and Habermann, in 1889, considered cholesteatoma to be the result of migration of the external ear canal epidermis into the tympanic cavity via a marginal perforation after acute or chronic otitis. It took 40 years of discussions about these three theories to finally confirm that Habermann and Bezold were correct.

I think it is very far and i would Look up Wikipedia to find out

First noted in the 1600s it was not until the late 1800 early 1900 that a true diagnosis iui s of the disease was established

Very little is available in my experience. Doctors are not very forthcoming if indeed they even know!

Not too sure but treatment has improved drastically and has gotten rid of the death rate

I don't know when it was discovered, but it has been around for centuries- most times people have been mistakenly been diagnosed as having an ear infection.

I don't know sorry maybe you can Google it