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What Is Orbital Cellulitis?

Orbital cellulitis is an acute infection of the tissues within the orbit, located behind the orbital septum. It often spreads from bacterial sinusitis, especially of the ethmoid sinuses in children. Patients develop painful swelling of the eyelids, proptosis, limited eye movements, and fever. Because the infection lies deep in the orbit, it can threaten vision and even life through cavernous sinus thrombosis or intracranial spread. Rapid recognition and treatment are critical.

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What Is Orbital Cellulitis?

Orbital cellulitis is an acute infection of the tissues within the orbit, located behind the orbital septum. It often spreads from bacterial sinusitis, especially of the ethmoid sinuses in children. Patients develop painful swelling of the eyelids, proptosis, limited eye movements, and fever. Because the infection lies deep in the orbit, it can threaten vision and even life through cavernous sinus thrombosis or intracranial spread. Rapid recognition and treatment are critical.

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Causes and Risk Factors

The most common source is extension of acute or chronic sinus infection through thin bony walls or venous channels. Trauma with orbital fractures, penetrating injuries, and spread from dental or facial infections are other routes. Immune compromise, poorly controlled diabetes, and chronic sinus disease raise risk. In younger children, ethmoiditis with lamina papyracea erosion is a frequent predisposing factor. Orbital cellulitis must be distinguished from preseptal cellulitis, which affects only eyelid tissues in front of the septum.

Clinical Features and Examination

Key signs include lid edema and redness, proptosis, pain worsened by eye movement, and restricted extraocular motility. Vision can be reduced, and color desaturation or a relative afferent pupillary defect suggest optic nerve involvement. Conjunctival chemosis and fever are common. In contrast, preseptal cellulitis has swollen lids but no proptosis, no restriction of globe movement, and usually preserved vision. Any doubt between the two patterns is handled as orbital disease until proven otherwise.

Diagnosis and Imaging

Diagnosis combines clinical findings with imaging, usually contrast enhanced CT of the orbits and sinuses. Imaging shows fat stranding, muscle enlargement, subperiosteal abscess, or diffuse orbital involvement, plus the state of the paranasal sinuses. Blood cultures, nasal cultures, and sometimes surgical drainage samples help guide antibiotic choice. Laboratory tests assess systemic infection and immune status. Urgent involvement of ophthalmology, otolaryngology, and pediatrics or internal medicine is common.

Treatment and Complications

Treatment starts with broad spectrum intravenous antibiotics directed at common sinus and skin pathogens, adjusted later based on culture results. Surgical drainage of a subperiosteal or orbital abscess is often needed, especially when vision is threatened or when medical therapy fails. Supportive care includes pain control and close monitoring of vision, pupils, and eye movements. Complications can include optic neuropathy, cavernous sinus thrombosis, meningitis, and brain abscess. Many patients recover well with prompt care, but delays can lead to permanent damage.

FAQs About Orbital Cellulitis

Is orbital cellulitis an emergency?

Yes, it is treated as an emergency because of the risk to both vision and life.

How is it different from preseptal cellulitis?

Orbital cellulitis involves tissues behind the septum with proptosis, painful eye movements, and possible vision loss, while preseptal disease is limited to the lids.

Will my child need surgery?

Some cases respond to antibiotics alone, but abscesses or worsening signs often require surgical drainage.

Can orbital cellulitis come back?

Recurrence is uncommon if sinus disease and risk factors are managed, but repeat episodes can occur in some patients with chronic sinus problems.

References

EyeWiki. ?Orbital Cellulitis.? https://eyewiki.org/Orbital_Cellulitis

NCBI Bookshelf (StatPearls). ?Orbital Cellulitis.? https://www.ncbi.nlm.nih.gov/books/NBK507901/

MSD Manual (Professional). ?Preseptal and Orbital Cellulitis.? https://www.msdmanuals.com/professional/eye-disorders/orbital-diseases/preseptal-and-orbital-cellulitis

Cleveland Clinic. ?Orbital Cellulitis: Causes, Symptoms & Treatment.? https://my.clevelandclinic.org/health/diseases/24499-orbital-cellulitis

University of Iowa, EyeRounds. ?Orbital Cellulitis in a Child.? https://webeye.ophth.uiowa.edu/eyeforum/cases/103-Pediatric-Orbital-Cellulitis.htm