Ovarian surface epithelial tumors Quiz: Ace Your Exams

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A 35-year-old woman comes to the emergency department due to abdominal pain that started suddenly several hours ago. Two hours ago, the patient felt a sudden, sharp pain in the lower abdomen during a routine workout at the gym. Since then, she has felt nauseated and vomited twice. Medical history is unremarkable. She denies any trauma or history of similar symptoms, vaginal bleeding, unprotected sexual intercourse, or history of sexually transmitted diseases. Temperature is 37°C (98.6°F), pulse is 98/min, respirations are 16/min and blood pressure is 127/74 mmHg. On physical examination, there is no guarding, but severe, right adnexal tenderness is noted. Urine pregnancy test is negative. Doppler ultrasound confirms the diagnosis of ovarian torsion and a thin-walled, unilocular cystic mass filled with anechoic fluid is visualized. The patient subsequently undergoes ovarian cystectomy and detorsion. The results of the histopathological examination are shown below:  


Reproduced from: Wikimedia Commons

Which of the following is the most likely diagnosis?

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