A 37-year-old woman presents with menorrhagia. She is married and has three children. On examination, cervix is normal. Routine blood tests show haemoglobin of 8 g/d L.Pelvic ultrasonogram shows an asymmetrically enlarged uterus with multiple well-circumscribed nodular masses.

What is the most likely cause of abnormal uterine bleeding in this patient?

A 14-year-old girl began menstruation one year ago. She now has abnormal uterine bleeding with menstrual periods of 2 to 7 days duration which occur 2 to 3 weeks apart. The amount of bleeding varies from minimal amount to very heavy flow. Physical examination is normal. A pelvic USG shows no abnormalities.

Which of the following is the most likely cause of abnormal uterine bleeding in this patient?

A 49-year-old perimenopausal woman has menometrorrhagia for the past 3 months. On physical examination there are no abnormalities. Pelvic ultrasonogram shows increased endometrial thickness. Endometrial biopsy shows closely packed endometrial glands as in the picture. There is no cellular atypia.

Which of the following is the most likely cause of abnormal uterine bleeding in this patient?

A 60-year-old postmenopausal woman observes a blood-tinged vaginal discharge twice during the past month. On physical examination, the cervix, uterus and adnexal structures are normal. She is obese and is under treatment for hypertension and diabetes mellitus.

Which of the following is most likely to be present in her endometrial biopsy?