<unk>  may mimic periorbital cellulitis early in its course<unk> 
Ocular emergency
Most often due to ethmoid sinusitis
May also be due to orbital trauma, endophthalmitis, infection from teeth / middle ear
Not caused by extension of periorbital cellulitis
Periorbital cellulitis
Usually benign
Most often due to contiguous infection of soft tissues of face and eyelids
Ocular emergency
Most often due to ethmoid sinusitis
May also be due to orbital trauma, endophthalmitis, infection from teeth / middle ear
Not caused by extension of periorbital cellulitis
Usually benign
Most often due to contiguous infection of soft tissues of face and eyelids
Orbital cellulitis
Normal IOP
Periorbital cellulitis
Orbital compartment syndrome
Orbital pseudotumor
Orbital tumor
Corneal ulcer
Increased IOP