Dr Chester points out a valid question, and we would like to clarify that the results of the SUMMIT study1 do not discount the validity of acute sinus infection as a cause of headache, nor do they suggest that clinicians should not thoroughly evaluate their patients before considering a differential diagnosis of the headache disorder.
Schreiber CP, Webster CJ. The Demise of the Sinus Headache Is Premature—Reply. Arch Intern Med. 2005;165(8):954–955. doi:10.1001/archinte.165.8.954-b