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Orbital Cellulitis – Causes, Symptoms & Treatment

Orbital cellulitis is a serious bacterial infection of the soft tissue within the bony eye socket. It is a medical emergency requiring immediate treatment to prevent vision loss.

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Things worth knowing about "Orbital Cellulitis"

Orbital cellulitis is a serious bacterial infection of the soft tissue within the bony eye socket. It is a medical emergency requiring immediate treatment to prevent vision loss.

What is Orbital Cellulitis?

Orbital cellulitis (also known as postseptal cellulitis or orbital phlegmon) is an acute, diffuse, purulent infection of the soft tissue and fat within the bony orbit (eye socket). Unlike preseptal (periorbital) cellulitis, which affects the eyelid tissue in front of the orbital septum, orbital cellulitis is located behind this anatomical barrier and involves the deeper orbital structures. It represents a serious ophthalmological and infectious emergency that, without prompt treatment, can lead to vision loss, intracranial spread, and life-threatening complications.

Causes

The most common cause of orbital cellulitis is the direct spread of infection from the adjacent paranasal sinuses, particularly the ethmoid sinuses. Other contributing causes include:

Spread of infection from facial cellulitis or dental abscesses
Traumatic injuries to the orbit, including foreign body penetration
Complications following ocular or maxillofacial surgery
Hematogenous spread (blood-borne infection), especially in children
Infections originating from dacryocystitis (lacrimal sac infection) or eyelid abscesses

The most commonly identified pathogens are Staphylococcus aureus, Streptococcus species, and in children, Haemophilus influenzae. In immunocompromised patients, fungal infections such as mucormycosis must also be considered.

Symptoms

Orbital cellulitis typically presents with a combination of local and systemic signs:

Proptosis (exophthalmos): protrusion or forward displacement of the eyeball
Chemosis: swelling and redness of the conjunctiva
Marked eyelid swelling and erythema
Pain with eye movement or complete restriction of eye movement (ophthalmoplegia)
Reduced visual acuity or sudden vision loss
Systemic symptoms: high fever, chills, and general malaise

Clinical distinction from the less severe preseptal cellulitis is essential, as both conditions may initially appear similar but require different management approaches.

Diagnosis

Diagnosis is based on clinical findings and confirmed by imaging:

CT scan of the orbit and paranasal sinuses: the gold standard for assessing the extent of infection, differentiating preseptal from postseptal involvement, and detecting abscess formation
MRI: used as a complementary tool, especially when intracranial complications are suspected
Blood tests: elevated inflammatory markers including CRP, white blood cell count, and ESR
Blood cultures: to identify the causative pathogen, especially if sepsis is suspected
Ophthalmological assessment: evaluation of visual acuity, pupillary response, and intraocular pressure

Treatment

Orbital cellulitis requires immediate hospital admission and a multidisciplinary approach involving ophthalmology, ENT (ear, nose and throat), and potentially neurosurgery.

Conservative Treatment

In early-stage cases without abscess formation, high-dose intravenous antibiotic therapy is the first-line treatment. Broad-spectrum antibiotics (e.g., ampicillin-sulbactam, piperacillin-tazobactam) are used empirically and adjusted once culture results and sensitivity testing are available.

Surgical Treatment

Surgical intervention is required when:

A subperiosteal or orbital abscess is identified on imaging
There is no response to antibiotic therapy within 24 to 48 hours
There are signs of threatened vision or intracranial spread

Surgical options include:

Abscess drainage: via endoscopic transnasal approach or external incision
Sinus surgery: to eliminate the primary source of infection (e.g., ethmoid sinusitis)

Potential Complications

Without timely treatment, orbital cellulitis can lead to severe complications:

Blindness due to optic nerve compression or vascular occlusion
Meningitis (inflammation of the membranes surrounding the brain)
Brain abscess
Cavernous sinus thrombosis (clotting in a major venous channel of the skull)
Sepsis (life-threatening systemic infection)

References

Chandler JR, Langenbrunner DJ, Stevens ER. The pathogenesis of orbital complications in acute sinusitis. Laryngoscope. 1970;80(9):1414-1428.
Wald ER. Periorbital and orbital infections. Pediatr Rev. 2004;25(9):312-320.
Nageswaran S, Woods CR, Benjamin DK Jr, Givner LB, Shetty AK. Orbital cellulitis in children. Pediatr Infect Dis J. 2006;25(8):695-699.

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