Sinusitis.

Paranasal sinusitis is one of the most common diseases treated in outpatient centers across the United States. Improved bacterial culture techniques have revealed the variety of pathogens involved in acute and chronic sinusitis. The growing numbers of antibiotic-resistant bacterial strains and of immunocompromised patients have changed the clinical face of sinusitis. New diagnostic modalities, including magnetic resonance imaging, are facilitating more rapid and accurate disease detection.