A 42-year-old man from Tamil Nadu presents with a 3-month history of left-sided epistaxis and progressive left ear fullness. On examination, he has left cervical lymphadenopathy (2 cm, firm, non-tender node at angle of jaw) and a left conductive hearing loss on Weber and Rinne testing. Flexible nasopharyngoscopy reveals a vascular mass in the nasopharynx obstructing the left Eustachian tube orifice. Biopsy shows undifferentiated carcinoma with strong EBV-encoded RNA (EBER) in situ hybridization positivity. What is the most likely diagnosis?