What Does The Following Ultrasound Report Indicate?

FINDINGS: THERE IS PERSISTENT RADIOLUCENT FILLING DEFECT IN LOWER UTERINE SEGMENT MEASURING APPROXIMATELY 6 MM IN DIAMETER AND 2.5 CM LONG OF INDETERMINATE NATURE. PLAIN FILM APPEARS UNREMARKABLE. CONTRAST-FILLED UTERINE CAVITY IS NORMAL IN LIMIT. REMAINDER OF CORPUS UTERUS APPEARS UNREMARKABLE. FALLOPIAN TUBES ARE NORMAL IN CALIBER AND PATENT BILATERALLY. POST EVACUATION FILMS REVEAL GOOD EMPTYING. NEED TO UNDERSTAND THIS READING THX