Definition: A calcification within the maxillary sinus, formed from long-standing mucus or foreign bodies, including tooth fragments.
Radiographic Features:
- Location: Within maxillary sinuses
- Edge: Well-defined, smooth or irregular outline
- Shape: Round or ovoid
- Internal structure:
- Radiopaque
- May show ‘laminated’ appearance (radiopaque and radiolucent bands)
- Other: None specific
- Number: May be single or multiple
Key points:
- Formed by gradual calcium salt deposition
- ‘Laminated’ appearance resembles layers of an onion
- Can vary in size
- May be asymptomatic or cause sinus-related symptoms
Clinical significance:
- Usually an incidental finding
- Can cause sinusitis or other sinus-related symptoms if large
- May require removal if symptomatic or interfering with sinus function
- Important to differentiate from other sinus pathologies
Note: Evaluate multiple images to ensure the radiopacity is not attached to the sinus border. If it appears attached in multiple views, consider antral exostosis/antral projection as a differential diagnosis.