A cold that lasts longer than a week may indicate inflammation of these airspaces in the skull
Chronic or recurring sinusitis lasts longer than eight weeks or occurs 
more .... A CT scan may indicate a sinus infection if any of these conditions is 
present:... [DOC] [TLE] Information On Sinusitis - Diet and Health.net [PAR] Sinusitis simply means inflammation of the sinuses, but this gives little ... Sinuses 
are hollow air spaces, of which there are many in the human body.