Cholesteatoma Induction:Consequences of External Auditory Canal Ligation in Gerbils, Cats, Hamsters, Guinea Pigs, Mice and Rats

Publisher Website
Google Scholar
Abstract
Surgical ligation of the external auditory canals of Mongolian gerbils produces aural cholesteatomas that are similar to spontaneous gerbilline cholesteatomas. These experimental cholesteatomas expand rapidly, medially displacing the tympanic membrane and eroding bone. Less than 2 mo. after ligation, half these cholesteatomas are in contact with the bony prominence of the cochlea. Ligation-induced formation of cholesteatomas may be unique to the gerbil. Keratin deposits are produced by similar ligations of the external auditory canals of cats, guinea pigs, hamsters, mice, and rats. In these animals there is no medial displacement of the tympanic membrane, no cholesteatoma formation, and no bone erosion. Cholesteatomas were not seen in cats, guinea pigs, hamsters, mice and rats even after postligation intervals of 6 to 36 mo.