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Sinusitis is diagnosed and managed based on clinical grounds and imaging is not indicated for initial diagnosis of uncomplicated sinusitis. CT remains the primary imaging study of choice for patients with acute and chronic sinusitis. CT is indicated when patients do not respond to medical management as patients may have a structural abnormality or obstructive lesion. Imaging is also indicated in patients who are suspected of having sinusitis related to orbital and intracranial complications, to immunocompromised state, or for pre-operative surgical planning.