Serous borderline tumours of the ovary represent a heterogeneous group of epithelial ovarian neoplasm. They are usually associated with a favourable outcome. Some of them have a worse prognosis. The most important prognostic factor is represented by the association with peritoneal implants (non-invasive and invasive). Tumours associated with noninvasive implants have an excellent prognosis and tumours associated with invasive implants have a fatal outcome. This article presents 15 serous borderline ovarian tumours, 12 associated with peritoneal implants, 2 of them with invasive implants and 10 with non-invasive implants. The authors present the main microscopic criteria for the diagnosis of peritoneal implants, their histogenesis and the importance for the management of these tumours.
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