Nasopharyngeal Swelling After Sinus Surgery for Cystic Fibrosis

A woman in her 20s with cystic fibrosis underwent bilateral endoscopic sinus surgery and medial maxillectomy 4 months after bilateral lung transplantation; at 6-week follow-up, she presented with throat pain, and 2 weeks later, with nasal obstruction. What is your diagnosis?

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