Maxillary sinus retention cysts (MRCs) are typically asymptomatic and require no treatment. An early 30s man presented with a decade-long history of severe left-sided chronic facial pain (CFP).

The simulation training was started with uncinectomy and maxillary antrostomy, followed by anterior and posterior ethmoidectomy, sphenoidotomy, and frontal sinusotomy. Forty-seven otolaryngologists, ...