Which sign is more typical of orbital cellulitis than preseptal cellulitis?

Which sign is more typical of orbital cellulitis than preseptal cellulitis?

• A. Eyelid edema
• B. Proptosis
• C. Conjunctival injection
• D. Ptosis

Answer: (D)

The sign tested reflects deeper involvement of the orbit behind the orbital septum. In orbital cellulitis, infection extends into the contents of the orbit, which can inflame or impair the muscles responsible for lifting the upper eyelid. This can lead to ptosis due to edema around the levator palpebrae superioris or related structures, signaling that the process is not just superficial eyelid swelling. Preseptal cellulitis, by contrast, is confined to the tissues anterior to the septum and typically causes eyelid swelling and redness without disrupting the lid’s elevation mechanism, so true ptosis is less likely. Other signs like eyelid edema or conjunctival injection can occur in either condition, and proptosis is a strong orbital sign but may not be present in all cases. Ptosis thus best indicates orbital involvement among the given options.

The sign tested reflects deeper involvement of the orbit behind the orbital septum. In orbital cellulitis, infection extends into the contents of the orbit, which can inflame or impair the muscles responsible for lifting the upper eyelid. This can lead to ptosis due to edema around the levator palpebrae superioris or related structures, signaling that the process is not just superficial eyelid swelling. Preseptal cellulitis, by contrast, is confined to the tissues anterior to the septum and typically causes eyelid swelling and redness without disrupting the lid’s elevation mechanism, so true ptosis is less likely. Other signs like eyelid edema or conjunctival injection can occur in either condition, and proptosis is a strong orbital sign but may not be present in all cases. Ptosis thus best indicates orbital involvement among the given options.