This antrochoanal polyp originated from within the left maxillary sinus. Note the stalk of the polyp as it enters the nasal cavity via an accessory maxillary sinus ostium located in the anterior nasal...
Accessory maxillary sinus ostia located in the anterior or posterior nasal fontanelle's are not infrequently seen in the middle meatus. A small accessory ostium is present in the anterior nasal fontanelle...
Mucus may circulate back into a maxillary sinus via an accessory ostium as seen here. Note the thick white stream of mucus flowing down from the hiatus semilunaris and reentering this right maxillary...
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.
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 [small]](https://medtube.net/images/min/02be235b3895c02d2f4ea4243d136b8e/149/112/1 "Accessory Maxillary Sinus Ostium [small]")
![Accessory Maxillary Sinus Ostium [CT scan]](https://medtube.net/images/min/68a3c676d8dbb112cff8f250e98e1741/149/112/1 "Accessory Maxillary Sinus Ostium [CT scan]")
![Accessory Maxillary Sinus Ostium [large]](https://medtube.net/images/min/bdf143c599d427f707c63a5490b893f8/149/112/1 "Accessory Maxillary Sinus Ostium [large]")