Noncholesteatomatous Cyst of the Tympanic Membrane: A Nonpublished Entity?

Figure 2

A 0.5 cm yellowish nodule (a). Histological macroview (HE 1.5x) (b). Multiloculated cystic formation lined by a monostratified nonmucin productor cuboidal epithelium (400x HE and 630x HE) (c) and (d). Immunohistochemical analysis shows cytokeratin-positive cells (AE1 and AE3) (e) and negativity for S100 protein, neural specific enolase, glial fibrillary acidic protein (GFAP), and synaptophysin (400x) (f).

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