The definition of Cholesteatoma is the cystic expanding lesion of the temporal bone, lined by stratified squamous epithelium and containing desquamated keratin.

• 摘要胆脂瘤为颞骨内增生出之囊状肿瘤，外层衬以复层鳞状上皮，此上皮又称为基质，内含剥落鳞状上皮堆积而成的角质。