MSRA-2713

A 75-year-old woman presents with post-menopausal bleeding. She has experienced multiple episodes over the past 6 months. The bleeding is heavy enough to require sanitary pads, but she denies any clots. She reports no bowel or urinary symptoms and has not experienced any weight loss. She went through menopause at 50 years old and took hormone replacement therapy for 2 years to alleviate hot flashes and mood swings. She has one child who was born via spontaneous vaginal delivery 45 years ago. There is no family history of gynaecological issues. What is the most probable diagnosis?