A 16-year-old girl presents with a 3-month history of progressive abdominal distension and pain. On examination, a firm, mobile, unilateral adnexal mass is palpable. Ultrasound shows a 12 cm complex ovarian mass with solid and cystic components. Serum α-fetoprotein (AFP) is 450 IU/mL (normal <10) and β-hCG is normal. What is the most appropriate next step in management?

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