"post-surgical change is also included in this group"
"Babbel et al. described five patterns of sinonasal obstruction 1, which are readily apparent on CT and widely used:"
Expected headings
"Infundibular pattern"
"Ostiomeatal unit pattern"
"Sphenoethmoidal recess pattern"
"Sinonasal polyposis pattern"
"Sporadic (unclassifiable) pattern"
"causes: mucosal swelling, turbinate hypertrophy, polyps, tumours/masses, concha bullosa, paradoxical middle turbinate, nasal septal deviation"