Study population and the distribution of CT indicationsa
| Indications | Cases | % |
|---|---|---|
| Chronic sinusitis | 823 | 62.6% |
| Upper respiratory infection/rhinitis | 142 | 10.8% |
| Sinus pain/pressure | 76 | 5.8% |
| Polyposis/mucocele | 35 | 2.7% |
| Fungal infection | 11 | 0.8% |
| Allergy | 25 | 1.9% |
| Asthma | 8 | 0.6% |
| Headache | 115 | 8.8% |
| Obstructive sleep apnea | 6 | 0.5% |
| Mass/cyst | 9 | 0.7% |
| Head and neck cancer | 8 | 0.6% |
| Pituitary mass | 6 | 0.5% |
| Wegener granulomatosis | 4 | 0.3% |
| Epistaxis | 12 | 0.9% |
| CSF leak | 6 | 0.5% |
| Trauma | 3 | 0.2% |
| Facial infection | 2 | 0.2% |
| Facial weakness | 3 | 0.2% |
| Anosmia | 5 | 0.4% |
| Vertigo/hearing loss | 8 | 0.6% |
| Otalgia | 1 | 0.1% |
| Acromegaly | 1 | 0.1% |
| Unspecified | 6 | 0.5% |
| Total | 1315 | 100% |
↵a The first 6 indications relate to sinusitis or upper respiratory symptoms, accounting for the majority of indications (1112 cases, 84.6%; 1315 sinus CT cases; male, 599, 45.6%; female, 716, 54.4%).