RT Book, Section A1 Shah, Ashish A1 Sobolewski, Brad A1 Mittiga, Matthew R. A2 Knoop, Kevin J. A2 Stack, Lawrence B. A2 Storrow, Alan B. A2 Thurman, R. Jason SR Print(0) ID 1181044507 T1 Orbital and Preseptal (Periorbital) Cellulitis T2 The Atlas of Emergency Medicine, 5e YR 2021 FD 2021 PB McGraw-Hill PP New York, NY SN 9781260134940 LK accessmedicine.mhmedical.com/content.aspx?aid=1181044507 RD 2024/04/24 AB Orbital cellulitis is a serious bacterial infection involving the fat and muscle within the orbit characterized by fever, painful purple-red eyelid swelling, ophthalmoplegia, pain with extraocular movements, proptosis, and variable decreased visual acuity. It may begin with eye pain and fever. In general, it is caused by Streptococcus anginosus, Streptococcus pneumoniae, Haemophilus influenzae, Moraxella catarrhalis, and S aureus. It usually arises as a complication of ethmoid or maxillary sinusitis. If not treated promptly, it can lead to blindness, cavernous venous sinus thrombosis, meningitis, subdural empyema, or brain abscess.