Epidermoid cyst of the testis
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.
- Benign.
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 without significant nuclear atypia.
- No adnexal structures.
- No intratubular germ cell neoplasia in the adjacent seminiferous tubules.
- No nuclear atypia.
Notes:
- Surround testis usually within normal limits.
- Granulomas may be seen in the context of cyst rupture.
DDx:
- Dermoid cyst - adnexal structures, e.g. sweat glands, hair follicules.
- Teratoma - nuclear atypia, multilocular, mesenchyme elements, ITGCN present.
- Mixed germ cell tumour.