Objective: To demonstrate a case of unrecognized endometrial cancer at endometrial ablation. Subject: Case report. Setting: Department of Obstetrics and Gynaecology and Department of Pathology, Jessenius Faculty Hospital, Martin, Slovakia Subject and Method: Authors describe a case of an early endometrial cancer diagnosed from material obtained by bipolar loop electrode during endometrial ablation. Conclusion: Authors poing out insufficiency of curettage as a method of endometrial biopsy prior to ablation. Using of the loop electrode may minimize the incidence of unrecognized malignancies.

        Key words: endometrial ablation, hysteroscopy, endometrial cancer