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8-month follow-up. These results suggest that frontal sinusotomy is not required to resolve frontal sinusitis associated with MSFB. As such frontal sinusitis appears to be a reactive process caused by fungal ball obstruction, it regresses spontaneously following fungus ball removal, drainage of the maxillary sinus, and middle meatal antrostomy. These results suggest that frontal sinusotomy is not required to resolve frontal sinusitis associated with MSFB. As such frontal sinusitis appears to be a reactive process caused by fungal ball