A 38-year-old woman from Kerala completes concurrent chemoradiotherapy (70 Gy EBRT + 3 cycles cisplatin) for Stage IIIA nasopharyngeal carcinoma 8 weeks ago. Post-treatment MRI shows a 2 cm residual mass in the nasopharynx with no distant metastasis. She is asymptomatic and tolerating oral intake well. What is the most appropriate next step in management?

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