A case of a 67 years-old woman with a cystic tumor of the left ovary is described. Focal growth of invasive squamous cell carcinoma was microscopically found. The cystic areas of the lesion were lined either by one layer of cuboidal epithelium or by multilayered squamous epithelium. The squamous epithelium represented metaplasia of the cuboidal epithelium. A thin layer of loose stroma with abundant iron-laden macrophages was frequently observed beneath the cuboidal epithelium. The patient denied any other therapy after the surgical operation. Eventually, the tumor locally recurred, and now the patient is receiving chemotherapy.

Κey words: Ovarian tumours, squamous cell carcinoma, ovarian endometriosis.

Full text in Greek