A 48-year-old woman with a history of ovarian cancer (stage IIIC, serous adenocarcinoma) completed 6 cycles of platinum-based chemotherapy 8 months ago. She now presents with rising serum CA-125 levels (from 12 U/mL to 85 U/mL over 2 months) and mild abdominal discomfort. Clinical examination is unremarkable. What is the most appropriate next investigation to assess for recurrence?

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