A rare clinical case of successful treatment of an interrupted ovarian pregnancy (ОР), the incidence of which is 0.4– 1.3 % of all ectopic pregnancies (ЕР), is described. The exact etiopathogenetic mechanism of OP development is still unknown. The rupture of OP mainly occurs in the first trimester of pregnancy 91.0 %, in the second trimester it is 5.3 %, and in the third it’s 3.7 %. Untimely diagnosis of EP in the ovaries can be fatal with massive bleeding and is associated with the risk of ovariectomy with a subsequent decrease in fertility in patients of reproductive age. It is very difficult to diagnose OP. Differential diagnosis should be carried out with interrupted tubal pregnancy, rupture of the ovarian cyst, as well as with torsion of the ovarian cyst. The article presents the results of a pathomorphological study confirming the diagnosis and adequacy of the performed therapeutic measures. The algorithm of OP diagnosis, justification and decision- making on the method of patient’s management and treatment are shown. The presented clinical case will allow physicians of various specialties to know about this EP rare form, to suspect and successfully diagnose OP in the early stages of gestation, which will avoid severe, and sometimes life-threatening, complications or reduce their development.

In Russia in 2017, according to the Rosstat data, ectopic pregnancy in the structure of maternal mortality was 8.10%, and in 2018 it decreased by 2 times, amounting to 4.18%. The frequency of rare forms of ectopic pregnancy reaches 5-8.3%, and the course is characterised by massive bleeding, often with a fatal outcome. The article describes rare cases of ectopic pregnancy that have occurred in our clinical practice and were interrupted at the terms of 13 and 15-16 weeks with a favourable outcome, which will be interesting not only for practicing obstetricians and gynaecologists, but also doctors of other specialties. The difficulties in the diagnosis, as well as the tactics of management and surgical treatment of these patients are described.