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Paranasal Sinus Carcinoma: Case Study%u2022 Brain trainer: A 46-year-old man complains of a blocked nose with occasional blood present on tissues when blowing. He also complains of pressure in his upper teeth, recent cheek swelling, and double vision. What is the most likely diagnosis?%u2022 Answer: Paranasal sinus carcinoma%u2022 Key points:%u2022 Nasal obstruction with epistaxis%u2022 Dental pain and facial swelling%u2022 Orbital symptoms (double vision)