Citation, DOI, disclosures and article data
At the time the article was created Maxime St-Amant had no recorded disclosures.View Maxime St-Amant's current disclosures
At the time the article was last revised Craig Hacking had the following disclosures:
- Philips Australia, Paid speaker at Philips Spectral CT events (ongoing)
These were assessed during peer review and were determined to not be relevant to the changes that were made.View Craig Hacking's current disclosures
It can be classified into three subtypes 1:
simple bulla (50%): a single cavity that usually communicates in the hiatus semilunaris
compound bulla (25%): 2-3 separate compartments that communicate with the hiatus semilunaris
It is formed by pneumatization of the bulla lamella and its degree of pneumatization is variable. In its most extreme form (giant ethmoid bulla), it may fill the entire middle meatus. Failure of pneumatization of the ethmoid bulla is termed torus ethmoidalis 3.
It usually opens in the retrobullar recess.