periorbital cellulitis
Pronunciation: per-ee-OR-bit-al sel-yu-LY-tis
Bacterial infection of the eyelid and surrounding tissues that does not involve the orbital contents, requiring differentiation from orbital cellulitis.
Full Definition
Periorbital cellulitis, also known as preseptal cellulitis, is a bacterial infection involving the eyelid and periorbital tissues anterior to the orbital septum. Unlike orbital cellulitis, it does not involve the contents of the orbit itself and typically does not cause vision changes, eye movement restriction, or proptosis. Common causes include Staphylococcus aureus and Streptococcus species, often following minor trauma, insect bites, or upper respiratory infections. While generally less serious than orbital cellulitis, periorbital cellulitis in young children requires careful monitoring as it can potentially progress to orbital involvement. Treatment typically involves systemic antibiotics, and hospitalization may be necessary for children under one year of age.
Usage
Usage note: Always distinguish from orbital cellulitis, which involves structures behind the orbital septum and is more serious.
In Context
- "The child presented with periorbital cellulitis characterized by eyelid swelling without vision changes or eye movement restriction." — Ophthalmology consultation
- "CT imaging helped distinguish periorbital cellulitis from the more serious orbital cellulitis." — Radiology report interpretation