Rhinitis is dened as the inammation of the nasal mucosa. However, since it is almost always accompanied with the inammation of the paranasal sinuses, the use of the term rhinosinusitis would be more accurate. Rhinosinusitis can be classied as acute (less than 1month) or chronic (more than 3months); and as viral or bacte­rial. In children, most cases occur as viral rhinosinusitis. The American Academy of Pediatrics denes acute bacterial sinusitis as a persistent illness with nasal discharge of any quality and/or daytime cough lasting for >10days without improvement, a worsening clinical course, a severe onset of symptoms with concurrent fever (tem­perature≥39°C), and purulent nasal discharge for at least 3 consecutive days [4]. Since the radiological imaging does not change the treatment approach, it is not recommended for the diagnosis of uncomplicated acute rhinosinusitis [5]. Radiography is not benecial for the diagnosis and follow-up of acute/chronic rhi­nosinusitis of pediatric patients due to difculty in positioning and evaluating par­ticularly the ethmoid sinuses. Furthermore, paranasal sinus opacication on CT and MRI can be encountered even in healthy children without a clinical sign of rhinosi­nusitis. Therefore, radiological imaging has a limited role in the diagnosis (6). As recommended by the American College of Radiology, the imaging modality of choice should be paranasal sinus CT without intravenous (IV) contrast administra­tion for surgical planning if functional sinus surgery is planned for chronic or recur­rent rhinosinusitis, and as paranasal and brain CT/MRI with IV contrast if rhinosinusitis/invasive fungal sinusitis with intracranial or orbital complication is suspected [6].