Coronal sinus CT is the imaging study of choice when evaluating patients with nasal polyposis. Coronal CT of the paranasal sinuses is the optimal modality for delineating the basic pathology, extent of disease, and possible bony destruction related to nasal polyps.
Bony details of the paranasal sinus anatomy are poorly visualized on MRI; as such, MRI is not an appropriate imaging modality for nasal polyposis in most cases. An exception would be when intracranial extension is suspected.
Radiography with Waters views has been shown to have sensitivity and specificity for showing opacification of the sinuses.
Learn more on the workup of patients with nasal polyps.
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Cite this: Arlen D. Meyers. Fast Five Quiz: Nasal Polyps - Medscape - Feb 06, 2020.