Abnormal Uterine Bleeding

A 32-year-old nulliparous woman complains of heavy menstrual bleeding for 3 years with normal pelvic examination and normal transvaginal ultrasound. Coagulation studies are normal. What is the most common cause of abnormal uterine bleeding in this clinical scenario?

A 35-year-old nulliparous woman with irregular, heavy menstrual bleeding for 2 years is found to have a normal pelvic examination and normal hemoglobin. Transvaginal ultrasound shows a 3 cm intracavitary lesion with a stalk. What is the most appropriate next investigation to confirm the diagnosis and assess resectability?

In the classification of abnormal uterine bleeding, which of the following is categorized under the COEIN group (non-structural causes)?

A 32-year-old woman presents with heavy menstrual bleeding for the past 6 months. Pelvic examination reveals an enlarged, irregularly nodular uterus. Transvaginal ultrasound shows multiple hypoechoic lesions within the myometrium without disruption of the endometrial-myometrial interface. Which single feature best distinguishes adenomyosis from uterine fibroids in this clinical scenario?

Which of the following is the most common cause of abnormal uterine bleeding in reproductive-age women?