PMC4275456_01
Intersinus septal cell:sagittal and coronal views.
arh0021400960001.jpg
PMC4275456_01_arh0021400960001.jpg
F1
Computed tomography revealed a very large hourglass-shaped intersinus septal cell measuring 15 mm in the anterior-posterior dimension and 44 mm in the superior-inferior dimension, with a narrow 2-mm hourglass infundibulum (Fig. 1).
PMC4275456_02
Anteriorly displaced type III cell:sagittal and coronal views.
arh0021400960002.jpg
PMC4275456_02_arh0021400960002.jpg
F2
A 13-year-old male patient with asthma and anterior drainage had radiographic findings of a large, partially opacified type III sinus cell extending through the ostium into the true right frontal sinus and causing obstruction of the frontal recess (Fig. 2).
PMC4275456_03
Excessively pneumatized agger nasi cell:sagittal and coronal views.
arh0021400960003.jpg
PMC4275456_03_arh0021400960003.jpg
F3
His computed tomography scans revealed extensive pneumatization of agger nasi cells bilaterally, causing symptomatic obstruction of the FSOT (Fig. 3).
Endoscopic view of maximally opened frontal sinus after removal of excessively pneumatized agger nasi cell.
arh0021400960004.jpg
PMC4275456_03_arh0021400960004.jpg
F4
This allowed for passage of endoscopic instruments into the frontal sinus, and the ostium was further enlarged using the standard instrumentation (Fig. 4).
PMC4275456_04
Type IV frontal sinus cell with intersinus septal cell:sagittal and coronal views.
arh0021400960005.jpg
PMC4275456_04_arh0021400960005.jpg
F5
A 60-year old male patient with a 1-year history of posterior drainage was found to have radiographic findings of a type IV frontal sinus cell on the right (Fig. 5).
Endoscopic view of maximally opened frontal sinus after removal of type IV frontal sinus cell.
arh0021400960006.jpg
PMC4275456_04_arh0021400960006.jpg
F6
The frontal sinus was then noted to be maximally opened and the frontal sinus cell was removed (Fig. 6).