Periorbital cellulitis:
A 2- year-old girl presented with fever, erythema, and swelling of the
left upper eyelid. There were no visual symptoms or proptosis. The findings
shown are suggestive of acute periorbital cellulitis, or more accurately,
preseptal cellulitis, an infection confined to the soft tissues of the eyelid.
Bacteriology of preseptal cellulitis includes those bacteria that cause
sinusitis (Haemophilus influenzae, Streptococcus pneumoniae, Moraxella catarrhalis,
S pyogenes); skin flora from trauma (Staphylococcus aureus and group A Streptococcus);
and idiopathic (H influenzae type B, S pneumoniae). (L.S.)