Reproductive-aged women constitute a high proportion of the patients with borderline ovarian tumors. This commonly poses a question about organ-sparing treatments, which in turn necessitates the assessment of a risk for recurrence. Objective — to evaluate the influence of morphological factors, such as histologic type, the presence of implants, psammous corpuscles, and micropapillary structures in the borderline tumor, on the development of a tumor recurrence. Material and methods. The material of the investigation was histological specimens of tumors from 101 women aged 18 to 63 years (mean age 32.14 years) who had been treated or advised at the P.A. Herzen Moscow Oncology Research Institute for a borderline ovarian tumor diagnosis. Results. Implants, psammous corpuscles, and micropapillary architecture are more frequently associated with recurrent tumors.