Ovarian cysts and tumors Quiz: Ace Your Exams

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A 30-year-old woman comes to the clinic due to intermittent sensations that her heart is racing. Over the past 2 months, the patient has experienced palpitations and lost 2.7 kg (6 lbs) without changes in her diet. The patient also notes she is sweating more than usual, which often makes her change her clothes to avoid embarrassment. Last menstrual cycle was 8 weeks ago, but it previously occurred every 28 days. The patient is sexually active with her partner, and they use condoms consistently. Temperature is 37.7°C (99.8°F), pulse is 110/min and irregular, and blood pressure is 135/85 mmHg. On physical examination, the thyroid gland is normal and nontender without nodules. The breasts appear normal. Pelvic examination shows a normal-sized uterus. A right-sided adnexal mass is palpated. Laboratory studies reveal TSH levels of 0.1 μU/mL. She subsequently undergoes laparoscopic unilateral salpingo-oophorectomy. The results of the pathohistological analysis reveal thyroid tissue found within the ovary, as shown below:

 A high magnification image shows tissue w/ irregular cellular growth on left vs normal tissue w/ follicular structures on right. Red blood cells fill open spaces.

Retrieved from: Wikimedia Commons

Which of the following is the most likely diagnosis?

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