Paranasal sinuses

Last revised by Craig Hacking on 16 Feb 2023

The paranasal sinuses usually consist of four paired air-filled spaces. They have several functions of which reducing the weight of the head is the most important. Other functions are air humidification and aiding in voice resonance. They are named for the facial bones in which they are located:

Variant anatomy

The paranasal sinuses are subject to marked variation between individuals and between sides in the same individual, regarding size (aeration) and bony septations.

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Cases and figures

  • Figure 1: annotated CT
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  • Case 1: normal paranasal sinuses x-ray series
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  • Case 2: normal paranasal sinus CT
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