|
Objectives: To demonstrate the progress of the intraocular,
intracanalicular and intracranial parts of optic nerve in the coronal
paranasal sinus tomography with usage of computed tomography
cysternogaphy.
Methods: 21 computed tomography cysternogaphy studies that had
been obtained for the reason of rhinorrhoea between January 2001 and
February 2006 in Başkent University Adana Research and Training Medical
Center were scanned retrospectively. The six cases in which the
distribution of opaque substance in subarachnoid space around the optic
nerve was optimum were examined.
Results: The averages of length of the intraocular and
intracanalicular parts were 25.50 mm and 6.50 mm respectively. The mean
length of intracranial part was 10.75 mm. Optic nerve was very close to
posterior ethmoidal sinuses in 4 cases and very close to sphenoidal
sinus in 8 cases. The mean length of this direct contact was 3.00 mm.
Conclusion: In this study, intraorbital and intracanalicular
parts of optic nerve were showed in the coronal paranasal tomography and
the estimation of optic nerve in coronal scans became easy. Optic nerve
should be evaluated at these points in cases with coronal scans only. If
there is any doubt about the progress of optic nerve and the integrity
of optic canal in coronal scans, then the evaluatian should be done with
usage of axial scans and magnetic resonance imaging. |
