Abstract:
Sphenoid sinus has got importance due to trans-
sphenoid approach to the pituitary gland. This study is an attempt
to know the variations in North Karnataka population, through
cadaveric dissection and CT scan study.
Objective: We want to study variations in sphenoid sinus and its
percentage in North Karnataka population.
Material and Methods: Endoscopic examination and dissection
of sphenoid sinus was carried out in 30 cadavers (three female and
27 male) using 0o, 30o, 70o rigid nasal endoscopes. Sections were
then made in the sagittal plane to confirm the anatomical findings
and to take the necessary measurements with millimeter strips.
Results: In six of cadavers pre-sellar, in four it was sellar and
in 20 it was post-sellar while conchal type of sphenoid sinus
was absent. The septa terminated on bone covering internal
carotid artery (ICA) in seven cadavers while in two cadavers they
terminated on the bone covering Optic nerve (ON). Findings of CT
scan study were pre-sellar-8, sellar-14 and post-sellar-37 and in
case of one subject left side sinus was conchal. Pneumatization
of greater wing of sphenoid was observed in two sinuses, of
pterygoid process in four sinuses and of anterior clinoid process
in two sinuses. We also found onodi cell in one sinus.
Conclusion: Sphenoid sinus shows various types of pneumat
isation, and this place the sinus in close proximity to important
neurovascular structures that are present around the sinus. Newer
techniques are used to confirm surgical landmarks making these
techniques very safe.
