20-year-old female. Sensation of pressure in the lower abdomen. A gynaecological examination showed resistance in left adnexal area, ultrasound revealed a cystic left ovary.
- Multilayered, keratinised squamous epithelium lining the cysts. The lumina contain a keratin mass. Subepithelial sweat glands and hair follicles.
- The cysts , processes and further epithelial structures are lined with brown reaction product, which is caused by cytokeratin intermediate filaments.
- Cartilage, connective tissue and adipose tissue may also be components of mesoderm tumours.