Epidermoid cyst of the testis
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Epidermoid cyst of the testis is a rare benign lesion of the testis. It is important to differentiate it from a testicular teratoma.
General
- Rare.
Gross
Features:[1]
- Unilocular cyst containing keratineous material with a laminated appearance.
Notes:
- Teratomas are usually multilocular.
- Presence of hair suggests a dermoid cyst.
Microscopic
Features:[1]
- Cyst lined by squamous epithelium.
- No adnexal structures.
- No intratubular germ cell neoplasia.
- No nuclear atypia.
DDx:
- Dermoid cyst - adnexal structures, e.g. sweat glands, hair follicules.
- Teratoma - nuclear atypia, multilocular, mesenchyme elements, ITGCN present.
- Mixed germ cell tumour.