Uterine sarcomas make up only 5% of all malignancies in gynecology. Their classification is complicated due to low incidence and large histological differences. Uterine sarcoma is usually diagnosed in postmenopausal women, and this is most often done accidentally at the postoperative stage. The existence of uterine sarcoma should be suspected in cases of rapid uterine growth in postmenopausal state. Postmenopausal abnormal bleeding is the most common reason for a medical examination. In this paper, a 48-year-old patient is presented in whose case during a regular gynecological examination; the existence of tumour change in the uterine part of uterus has been noticed. The patient did not have gynecological problems until then. The patient was then subjected to a diagnostic exploratory curettage. The pathohistological finding was negative. Given that the onset change is present after the control check, it is decided to proceed with an operative procedure. A pathohistological finding (uterus and adnexa) indicates that it is a uterine sarcoma. After that, the patient was re-treated with two more operations and then had chemotherapy and radiation therapy. After completing the whole treatment, for the period of six years, the patient now feels well and performs her usual work tasks.