The sensitivity of diagnostic endoscopy for frontal recess, middle turbinate and bulla ethmoidalis was found as 91%, 84% and 76% respectively and for sphenoethmoidal recess
hiatus semilunaris and middle turbinate as 80%, 53% and 67% respectively.
(1,2) The most consistent drainage pattern of the ethmoid bulla is a path from the posterior medial aspect of the bulla medially into the
hiatus semilunaris superior.
The parameters used for correlation were- Deviated Nasal Septum, Inferior Turbinate Hypertrophy, Middle Turbinate abnormalities, Concha Bullosa, Agger Nasi cells, Haller cells, Frontal recess, Infundibulum,
Hiatus semilunaris, Uncinate process attachment, Intrasinus mucosal disease of Maxillary, Ethmoids, Frontal and Sphenoid detailed history, clinical examination and routine investigations were done for the patients.
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.