2. • Paranasal sinuses are air-containing cavities in certain bones of skull.
• They are four on each side.
1. Anterior group. This includes maxillary, frontal and anterior ethmoidal. They all
open in the middle meatus and their ostia lie anterior to basal lamella of middle
turbinate.
2. Posterior group. This includes posterior ethmoidal sinuses which open in the
superior meatus and the sphenoid sinus which opens in sphenoethmoidal recess.
3. MAXILLARY SINUS
• largest of paranasal sinuses and
occupies the body of maxilla.
• Ethmoid sinuses - thin-walled air
cavities in the lateral masses of
ethmoid bone. Their number varies
from 3 to 18. They occupy the space
between upper third of lateral nasal
wall and the medial wall of orbit
4. FRONTAL SINUS
• Each frontal sinus is situated between the inner and outer tables of frontal bone,
above and deep to the supraorbital margin.
5. SPHENOID SINUS
• It occupies the body of sphenoid.
• The two, right and left sinuses, are rarely
symmetrical and are separated by a thin
bony septum
• Ostium of the sphenoid sinus is situated
high up in the anterior wall and opens
into the sphenoethmoidal recess, medial
to the superior or supreme turbinate
6.
7. INDICATIONS FOR IMAGING
• Rhinosinusitis – acute or chronic
• Complications
• Local
• Orbital
• Intracranial
• Descending infections
• Focal infections
• Neoplasms
• Trauma
13. Case courtesy of Dr Bruno Di Muzio, Radiopaedia.org, rID:
31870
Case courtesy of Assoc Prof Frank Gaillard,
Radiopaedia.org, rID: 4890
14. CASE 1
Case courtesy of Dr Aditya Shetty, Radiopaedia.org, rID:
27309
A 25 year old female came with history of
headache, tenderness over the cheeks,
postnasal discharge and mild fever
16. CASE 2
Case courtesy of A/Prof Sergio Uribe, Radiopaedia.org, rID:
46427
A 32 year old male patient presented with frontal
headache, tenderness over the
forehead and nasal discharge
