Diagnostic Imaging for Nasal Polyps in Chronic Sinusitis

Introduction to Diagnostic Options

The American Academy of Otolaryngology-Head and Neck Surgery recommends initial assessment to include careful examination of the nasal airway, but this has limitations for detecting smaller polyps 1
The American College of Radiology suggests that CT scan remains the gold standard in radiologic evaluation of chronic rhinosinusitis and nasal polyps 2, 3

CT scan provides detailed information on the extent of polyp involvement throughout the nasal cavity, status of bony landmarks, integrity of the orbit and cranial vault, and anatomical variants that may contribute to sinus disease 1, 3, 4
The American College of Radiology recommends CT scan for evaluating the full extent of disease, particularly for unilateral polyps, polyps extending outside the nasal cavity, atypical presentations, and preoperative evaluation 1, 4
Multiplanar CT imaging offers both bone detail and soft-tissue imaging, and coronal CT provides excellent anatomic bony detail 4

The Lund-Mackay scoring system is commonly used to quantify sinus disease on CT, based on degree of opacification for each sinus and OMC, with a maximum score of 24 2

The presence of nasal polyps affects treatment management, particularly regarding the use of topical or systemic corticosteroid therapy, according to the American Academy of Otolaryngology-Head and Neck Surgery 1
Approximately 4% of patients with chronic rhinosinusitis have concurrent polyps, and there is an association between asthma, nasal polyps, and aspirin sensitivity 1

The American Academy of Otolaryngology-Head and Neck Surgery recommends CT after failure of appropriate medical or surgical treatment in secondary care with continued symptoms and abnormal endoscopy 2
CT should be obtained in diagnosing or evaluating patients with chronic rhinosinusitis or recurrent acute rhinosinusitis, as suggested by the American College of Radiology 5

The American Academy of Otolaryngology-Head and Neck Surgery recommends CT scanning for its superior sensitivity in detecting sinonasal inflammation, with excellent diagnostic accuracy, compared to diagnostic nasal endoscopy, which has good but lower sensitivity 6, 7, 8
CT demonstrates excellent sensitivity for detecting inflammation throughout all paranasal sinuses, while nasal endoscopy has good but lower sensitivity 6, 7, 8
CT identifies disease in all sinus cavities, including the maxillary, frontal, sphenoid, and ethmoid sinuses, regardless of anatomic obstruction 9, 10

CT provides anatomic detail that is absolutely required before any surgical intervention, including the ostiomeatal complex anatomy, bony landmarks, and anatomic variants that determine surgical approach 9, 10
Multidetector CT technology allows reconstruction of all planes from a single scan, reducing radiation exposure while providing comprehensive anatomic information 9, 10

CT provides permanent documentation of disease extent that can be reviewed by multiple specialists 7, 8

CT detects fungal sinusitis, mucoceles, and other conditions that may not be apparent on endoscopic examination 9

The American Academy of Otolaryngology-Head and Neck Surgery recommends reserving CT for specific indications rather than routine initial diagnosis due to significant drawbacks such as radiation exposure and high cost 6, 7, 8
Radiation exposure is a meaningful risk, particularly in patients requiring repeated evaluations 6, 7, 8

The American Academy of Otolaryngology-Head and Neck Surgery provides clear guidance on when to use each modality, reserving CT for surgical planning, prolonged or complicated clinical course, suspected complications, and recurrent acute rhinosinusitis 6, 9