When evaluating a 12-year-old with rhinitis and facial pain, which statement about testing for sinusitis is most accurate?

When evaluating a 12-year-old with rhinitis and facial pain, which statement about testing for sinusitis is most accurate?

• A. X-ray opacities in the sinuses confirm bacterial sinusitis
• B. Some mucosal thickening can be seen only on computed tomography or magnetic resonance imaging, so these studies should be ordered in place of plain films
• C. Radiographic studies are most accurate in the early stages of a respiratory infection
• D. Other upper respiratory tract conditions can result in abnormal radiographic findings, so sinus aspirate is the only positive test

Answer: (D)

Imaging findings in sinusitis are not specific enough to confirm a bacterial infection. Other upper airway conditions, like viral rhinitis or allergic rhinitis, can cause radiographic opacities or mucosal thickening, so a plain film or even CT findings alone can be misleading. The most definitive way to identify bacterial sinusitis is to obtain a sample of sinus drainage and culture it—the sinus aspirate—because it directly shows whether a bacterial pathogen is present. Therefore, because radiographic abnormalities can arise from various URIs, the test that truly confirms infection is the sinus aspirate. In practice, imaging is not routinely used to make the diagnosis, and aspiration is reserved for cases where a microbiologic confirmation is necessary.

Imaging findings in sinusitis are not specific enough to confirm a bacterial infection. Other upper airway conditions, like viral rhinitis or allergic rhinitis, can cause radiographic opacities or mucosal thickening, so a plain film or even CT findings alone can be misleading. The most definitive way to identify bacterial sinusitis is to obtain a sample of sinus drainage and culture it—the sinus aspirate—because it directly shows whether a bacterial pathogen is present. Therefore, because radiographic abnormalities can arise from various URIs, the test that truly confirms infection is the sinus aspirate. In practice, imaging is not routinely used to make the diagnosis, and aspiration is reserved for cases where a microbiologic confirmation is necessary.