Radiological evidence of sinus infection in patients with multiple sclerosis.

The prevalence of radiological criteria of chronic sinus infection was compared in 42 cases of clinically definite or laboratory supported definite multiple sclerosis and 84 controls. No increase in relative risk of multiple sclerosis associated with the presence of chronic sinus infection was observed (odds ratio 1.2, 95% CI 0.5 to 3.1). The maxillary sinus was infected more often than the other paranasal sinuses but there was no difference in the distribution of infection within the sinuses between cases and controls. These results do not confirm an earlier report of an association between chronic sinus infection and multiple sclerosis.