Chronic non-puerperal uterine inversion is a rare condition that usually presents with vaginal bleeding and vaginal mass. Frequently, it is caused by benign and malignant tumors. A mass in the vagina, particularly if it is a malignant tumor, can be confused with a uterine malignancy without inversion. Clinical diagnosis of chronic uterine inversion is difficult and may be diagnosed during surgery. In this report, we present a case of chronic uterine inversion diagnosed as a uterine sarcoma by punch biopsy.