The direct connection between the left maxillary sinus and the left middle meatus seen on this coronal CT scan is an accessory maxillary sinus ostium through the posterior fontanelle.
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![Accessory Maxillary Sinus Ostium [CT scan]](https://medtube.net/images/min/68a3c676d8dbb112cff8f250e98e1741/750/750/3)
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