3. Imaging modalities
CT Scan is choice of Imaging
PLAIN X-RAY CT Scan MRI
Ability to accurate demonstration of fine bone anatomy of
O.M.C & extent of the disease in & around the P.N.S .
4. Reading CT Films
Planes :Coronal / Axial /sagittal
Mark: R/L sides properly
Bone 1000-3000 (HU) or soft tissue window 400-800
(HU).
Read from Nasion to Sphenoid sinus (4-5)mm,extensive
disease and revision surgery (3mm)coronal cut and axial
cut should advised
Study following in all Sections
Nasal Septum
Lamina Papyracea
Skull Base
Native or contrast
6. systematic way of reading the CT film
anatomy
anatomical variations
pathology
structures which may be at risk
skull base
orbit
optic nerve
internal carotid artery
7. •Preparation and position of the patient:
1.not to be fasting
2.blow the nose to clear out any secretions
3.hyper extended neck
software found reconstruct the coronal and sagittal plane
from axial plane
Post op. CT-scan:
1.Not recommended as routine.
2.Done after 6months of ESS
63. Pathology is
1. Homogenous/heterogenous
2. Densities (hypodense /isodense /hyperdense)
3. Calcification
4. Bone erosion around opacified area
5. Start on affected side Ant. To Post.
6. Look at opposite site Ant. To Post.
7. Look to the integrity of the vital structures.
64. Acute Sinusitis
Air Fluid level
Mucosal thickening
Complete opacification of the sinus
65. Chronic Sinusitis
Ethmoid sinus is commonly involved
Mucosal thickening
Bone remodeling due to osteitis
Polyposis
66. fungal sinusitis
Complete opacification of multiple sinuses
Sinus expansion & erosion of sinus wall
Focal area of increased attenuation that is
created within a diseased sinus
67. fungal sinusitis
When you suspect the fungal infection you
should ask for soft tissue window