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.
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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