Management of Periorbital Cellulitis

Classification and Diagnosis

The American Academy of Pediatrics recommends high-dose amoxicillin-clavulanate as the initial treatment for periorbital cellulitis for comprehensive coverage of the most common causative organisms 1
Diagnosis of periorbital cellulitis is based on clinical presentation with signs including erythema, tenderness, and induration of the eyelid 2
The most useful imaging modality to differentiate preseptal from postseptal involvement and to identify potential complications is a CT scan of the orbits with IV contrast 3

For mild cases with eyelid less than 50% closed, outpatient treatment with high-dose amoxicillin-clavulanate is appropriate, with daily follow-up until definite improvement is noted 1
Treatment duration typically ranges from 5-7 days, but should be extended if infection has not improved 4
Hospitalization is indicated if patient does not improve within 24-48 hours of outpatient therapy, infection is progressive, or presence of proptosis, impaired visual acuity, or impaired/painful extraocular mobility 1
Systemic signs of infection are an indication for hospitalization 2

If MRSA is suspected, appropriate coverage should include vancomycin, clindamycin, trimethoprim-sulfamethoxazole, or doxycycline 4
For orbital complications, consultation with otolaryngology, ophthalmology, and infectious disease specialists is recommended 1

Patients with mild cases treated as outpatients should be reassessed within 24-48 hours 1
For hospitalized patients, daily assessment is necessary to monitor response to therapy 1
CT imaging should be performed if there is clinical suspicion of progression to orbital involvement or intracranial complications 3

Delaying appropriate imaging in cases with concerning features such as proptosis, visual changes, or ophthalmoplegia 3
Not considering MRSA coverage when risk factors are present 4
Inadequate duration of therapy or failure to reassess response after initial treatment 4

Periorbital cellulitis is most commonly caused by Streptococcus species and Staphylococcus aureus, and antibiotics should cover both streptococci and staphylococci, as recommended by the Infectious Diseases Society of America 5, 6
For empiric therapy, the American Academy of Pediatrics and the Infectious Diseases Society of America suggest that antibiotics should cover both streptococci and staphylococci 5

Parenteral therapy options include penicillinase-resistant penicillin (nafcillin) and first-generation cephalosporin (cefazolin), as suggested by the Infectious Diseases Society of America 5

For patients with severe penicillin allergies, clindamycin or vancomycin are appropriate alternatives, according to the Infectious Diseases Society of America 5

The Infectious Diseases Society of America recommends parenteral options such as Nafcillin (penicillinase-resistant penicillin) or cefazolin (first-generation cephalosporin) for inpatient management of moderate to severe cases, with an alternative regimen of Ceftriaxone plus clindamycin showing effectiveness in pediatric series 7, 8
For patients with severe penicillin allergy, Clindamycin or vancomycin are recommended as alternative options 7, 8

The most common pathogens in periorbital cellulitis are Staphylococcus aureus and Streptococcus species, which is why empiric coverage must target both, according to the Infectious Diseases Society of America 7, 8