CT FINDINGS IN GENERAL-PRACTICE PATIENTS WITH SUSPECTED ACUTE SINUSITIS

Purpose: To study CT findings in general practice patients with a clin ical diagnosis of acute sinusitis, and to examine the interobserver va riation between 2 radiologists with regard to their CT evaluation. Mat erial and Methods: Two hundred and one patients were examined with cor onal CT images of the paranasal sinuses within 2 days of the clinical diagnosis. Patients with chronic sinusitis were excluded. Fluid level or total opacification of any sinus were used as evidence of sinusitis . Results: One hundred and twenty-seven (63%) patients had fluid level or total opacification in a sinus region, most in more than one regio n. One hundred and fifteen had CT signs of sinusitis in the ethmoid re gion, 84 in the maxillary, 18 in the frontal, and 10 in the sphenoid. Forty-nine patients had a negative CT. In the evaluation of interobser ver agreement, the overall assessment of the CT yielded a kappa value of 0.70. Conclusion: The study demonstrated great variation in the CT findings in general practice patients with suspected acute sinusitis. More than one sinus region was affected in most patients in whom sinus itis was confirmed by CT imaging; the most common combination was ethm oid and maxillary sinuses. The interobserver agreement was substantial .