[Epidermoid formation in the pathogenesis of congenital cholesteatoma--a current review].
BACKGROUND
Many theories have been suggested regarding the origin, pathogenesis, diagnosis, and incidence of congenital cholesteatoma.


METHODS
An overview on the current literature on congenital cholesteatoma of the middle ear is presented. It comprises the possible etiology and pathogenesis of congenital cholesteatoma. Among other theories, germ scattering, metaplasia, ingrowth of meatal epidermis, and reflux of amniotic fluid have been proposed. Special emphasis is put on the epidermoid formation theory, which has been described by Michaels and others.


CONCLUSIONS
It is widely accepted that congenital cholesteatomas may originate from the postpartum persistence of epidermoid formations. Nevertheless, a clear transition from epidermoid formation to congenital cholesteatoma has yet to be confirmed.
Sudhoff
H
H
Hals-Nasen-Ohrenklinik, Ruhr-Universität Bochum, St. Elisabeth Hospital. Holger.Sudhoff@ruhr-uni-bochum.de
Liang
J
J
Dazert
S
S
Borkowski
G
G
Michaels
L
L
D018424:Cholesteatoma, Middle Ear / Q000151:congenital* / Q000209:etiology*; D004432:Ear, Middle / Q000002:abnormalities / Q000196:embryology; D004817:Epidermis / Q000002:abnormalities* / Q000196:embryology; D006801:Humans