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A 23-year-old G0P0 African-American woman presents to her gynecologist for her annual examination. She has no significant gynecologic history, but her mother has a history of endometrial cancer. She is currently in a monogamous relationship with her boyfriend of 3 years. She denies any history of pregnancy, pelvic pain, sexually transmitted diseases, or excessive vaginal bleeding. On examination her physician feels a firm, irregular mass. The gynecologist suspects that the patient has a uterine fibroid and confirms this diagnosis by transabdominal ultrasound.
What is the underlying etiology of this uterine fibroid?
A. Benign neoplastic growth of uterine endometrial cells
B. Benign neoplastic growth of uterine myocytes
C. Invasion of endometrial glandular cells into the myometrium
D. Malignant neoplastic growth of uterine endometrial cells
E. Malignant neoplastic growth of uterine myocytes
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