Imaging Guidelines for Diagnosing Sinusitis in the Emergency Department
Introduction to Sinusitis Diagnosis
- The American College of Radiology recommends non-contrast CT as the gold standard imaging modality for diagnosing sinusitis in the emergency department when imaging is clinically indicated 1, 2
- Uncomplicated acute sinusitis should be diagnosed based on clinical criteria alone without any radiographic imaging, as recommended by the American College of Radiology and the American Academy of Otolaryngology-Head and Neck Surgery 3, 4
Indications for Imaging
- Imaging should be considered in cases of persistent sinusitis, recurrent or chronic sinusitis, or when complications are suspected, such as orbital or intracranial complications, as recommended by the American College of Radiology 1, 5
- The American Academy of Otolaryngology-Head and Neck Surgery suggests that imaging should not be obtained to distinguish bacterial from viral sinusitis in uncomplicated cases 4
Imaging Modality Selection
- Non-contrast CT is the preferred imaging modality for evaluating sinusitis, as it accurately depicts sinus anatomy and soft-tissue changes, and provides essential anatomical detail for surgical planning, according to the American College of Radiology 1, 2, 5
- CT with IV contrast is reserved for cases with suspected complications, and should include coverage of sinuses, orbits, and brain, as recommended by the American College of Radiology 1, 5, 6
- MRI is not first-line for sinusitis in the ED, but may be indicated for suspected intracranial complications, fungal sinusitis, or neoplasm, according to the American College of Radiology 1, 5, 6
Special Considerations
- In ICU patients, a high index of suspicion is needed for nosocomial sinusitis, and CT is the preferred imaging modality for diagnosis, although this recommendation is from Praxis Medical Insights, an alternative source suggests similar guidance 7
- In immunocompromised patients, a lower threshold for imaging is recommended due to the risk of invasive fungal sinusitis, and CT with contrast or MRI may be necessary, as suggested by the American College of Radiology 5, 6