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→Evaluation: +Attenuation
File:CT of the ostiomeatal complex, coronal plane, with annotations.png|Ostiomeatal complex (green area)
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:If detected, measure the attenuation of the mucus. Acute sinus secretions have a radiodensity of 10 to 25 [[Hounsfield unit]]s, but in a more chronic state they become more viscous, with a radiodensity of 30 to 60 HU.<ref>[https://books.google.com/books?id=FxUgUBVBmUUC&pg=PA674 Page 674] {{webarchive|url=https://web.archive.org/web/20170216044325/https://books.google.com/books?id=FxUgUBVBmUUC&pg=PA674 |date=2017-02-16 }} in: {{cite book|title=Cummings Otolaryngology – Head and Neck Surgery: Head and Neck Surgery, 3-Volume Set|author=Paul W. Flint, Bruce H. Haughey, [[John Niparko|John K. Niparko]], Mark A. Richardson, Valerie J. Lund, K. Thomas Robbins, Marci M. Lesperance, J. Regan Thomas|publisher=Elsevier Health Sciences|year=2010|isbn=9780323080873}}</ref>
*Any sclerotic thickening of the walls of the sinuses, indicating chronic sinusitis.
*Any abnormal protrusion of teeth into the maxillary sinuses.<ref name="ScheinfeldShifteh2012">{{cite journal|last1=Scheinfeld|first1=Meir H.|last2=Shifteh|first2=Keivan|last3=Avery|first3=Laura L.|last4=Dym|first4=Harry|last5=Dym|first5=R. Joshua|title=Teeth: What Radiologists Should Know|journal=RadioGraphics|volume=32|issue=7|year=2012|pages=1927–1944|issn=0271-5333|doi=10.1148/rg.327125717}}</ref>
