maxillary air sinus

maxillary air sinus

[′mak·sə‚ler·ē ¦er ‚sī·nəs]
(anatomy)
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Presence/Absence of the maxillary air sinus. The maxillary sinus was present bilaterally in n=477 individuals (99.4%) and absent bilaterally in n=3 individuals (0.6%).