Preseptal Cellulitis Diagnostic Criteria

Clinical Diagnostic Features

• The American College of Radiology recommends that preseptal cellulitis is diagnosed clinically when infection is confined to the eyelids and soft tissues anterior to the orbital septum, presenting with periorbital erythema, edema, warmth, and tenderness without signs of orbital involvement (proptosis, ophthalmoplegia, or vision changes) 1, 2
• Warmth and tenderness of the affected eyelid and periorbital tissues are key clinical findings 3, 4
• Absence of proptosis is a key distinguishing feature from orbital cellulitis 1, 2
• Pain with extraocular movements suggests orbital involvement 1
• Vision changes indicate orbital or posterior involvement 5

Predisposing Factors and Etiology

• Percutaneous introduction of pathogens through skin breaks or trauma is a common source of preseptal cellulitis 1, 2, 5
• Odontogenic origin is another possible source of preseptal cellulitis 1, 2

Risk Factors for Progression to Orbital Cellulitis

• High neutrophil count is a risk factor for progression to orbital cellulitis 1, 2
• Absence of infectious conjunctivitis is a risk factor for progression to orbital cellulitis 1, 2
• Gross periorbital edema is a risk factor for progression to orbital cellulitis 1, 2
• Age >3 years is a risk factor for progression to orbital cellulitis 1, 2
• Previous antibiotic therapy is a risk factor for progression to orbital cellulitis 1, 2

Diagnostic Workup

• The American College of Radiology recommends that most cases of preseptal cellulitis are diagnosed clinically without need for imaging or cultures 3, 4
• Blood cultures are unnecessary for typical uncomplicated preseptal cellulitis 3, 4
• Consider blood cultures only if severe systemic features present (high fever, hypotension, confusion) 3, 4
• Imaging is NOT routinely required for straightforward preseptal cellulitis, but should be obtained when clinical findings cannot reliably distinguish preseptal from orbital cellulitis, or when signs of orbital involvement are present 1, 2, 6
• CT orbits with IV contrast is the imaging modality of choice when imaging is indicated 1, 2, 7, 6
• MRI of orbits and head with and without contrast is complementary to CT and should be considered when more detailed assessment of intraorbital spread or intracranial complications is needed 1, 2, 8, 6

Common Pitfalls

• Assuming all periorbital infections are preseptal can lead to delayed diagnosis and treatment of orbital cellulitis 1, 2
• Delaying imaging when indicated can prevent progression to vision-threatening complications 1, 2