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Related to hiatus semilunaris: Ethmoidal bulla, Frontonasal duct, Ostiomeatal Unit
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According to Yanagisawa et al, the ostium of the ethmoid bulla is often found in the hiatus semilunaris superior, but it can also be found in the anterior or lateral wall of the ethmoid bulla, the ethmoid infundibulum, the hiatus semilunaris inferior, and the retrobullar recess.
1) The ostium of the ethmoid bulla is usually found in the posterior and medial aspect of the bulla draining into the hiatus semilunaris superior; sometimes it is found in the anterior or lateral ethmoid bulla wall, the ethmoid infundibulum, the retrobullar recess, or the hiatus semilunaris inferior.
The expanded maxillary sinus had obliterated the left infundibulum, the hiatus semilunaris, the middle turbinate, and the middle meatus.