A large accessory maxillary sinus ostium is present through the posterior fontanelle of this left side. Note the prominent nasal septal spur protruding into the middle meatus and abutting against the...
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![Accessory Maxillary Sinus Ostium [large]](https://medtube.net/images/min/bdf143c599d427f707c63a5490b893f8/149/112/1 "Accessory Maxillary Sinus Ostium [large]")