A 40 years old multi gravida woman comes to the hospital with two months history of worsening right pelvic pain. She experiences the pain daily. The intensity does not vary with menstruation. The patient's waist size was increased despite her poor appetite. The pelvic examination shows irregularly shaped fixed adnexal mass. One week later, the patient undergoes surgery for removal of large ovarian neoplasm. Within the true pelvis, the surgeon can most likely palpate the right ureter immediately anterior to