Cellulitis:
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Self-assessment
On clinical examination, an ophthalmologist can distinguish between orbital and periorbital cellulitis.
As periorbital cellulitis worsens, it becomes an orbital cellulitis.
Fever and leucocytosis occur commonly in both orbital and periorbital cellulitis.
Changes in the density of orbital tissues on CT scan are seen in orbital but not periorbital cellulitis.
Extraocular muscle palsy and/or proptosis are helpful in distinguishing orbital and periorbital cellulitis.
Periorbital cellulitis rarely has an obvious external cause.
Reduced visual acuity is helpful in distinguishing periorbital from orbital cellulitis.
The bulbar conjunctiva (globe) is injected in orbital cellulitis but rarely in periorbital cellulitis.
Cellulitis:
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