NCIt definition : A pathologic process characterized by the proliferation of keratinizing squamous epithelium
resulting in the accumulation of keratin and cells in the middle ear and/or mastoid.
It may be congenital or acquired. If left untreated, it may increase in size and destroy
adjacent structures.;
Alternative definition : CDISC: A squamous cyst that may contain cholesterol clefts and granulomatous inflammation.
(INHAND);