Histology Course S XI 7 Department of Pathology, University of Zurich Histokurs

S XI 7 Mature teratoma. ICH pancytokeratine. Ovary    IHC: LU-5 further information (German) on HiPaKu
  ICD-10: C56.9; ICD-O: 9080/1

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.