May 28, 2009

Image: Epidermoid Cyst

What you are seeing above is an epidermoid cyst. It is located inside the posterior cranial fossa, the lower-back area of the skull that contains the cerebellum and brainstem. Click on the image to see an enlarged version.

Epidermoids tend to have a smooth grey surface and contain friable waxy material inside. It is different to a dermoid cyst in that it tends to connect to and envelop adjacent structures whereas dermoid structures usually have defined boundaries. Their presence can be ascertained 'outside' as a mobile, rubbery mass that presents as a cosmetic deformity.

Operative removal must be undertaken with care, as spillage of the tumour can occur which may lead to forms of meningitis or ventriculitis.

- Source: NeuroWiki.

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