"stage I: preseptal orbital cellulitis with inflammation and oedema anterior to the orbital septum."
"stage II: orbital cellulitis with extension of the inflammation and oedema beyond the orbital septum."
"stage III: subperiosteal abscess beneath the periosteum of lamina papyracea."
"stage IV: orbital abscess and purulent collection within orbit."
"stage V: cavernous sinus thrombosis after posterior extension of the infection through the superior ophthalmic veins."
"stage I: preseptal orbital cellulitis with inflammation and oedema anterior to the orbital septum."
"stage II: orbital cellulitis with extension of the inflammation and oedema beyond the orbital septum."
"stage III: subperiosteal abscess beneath the periosteum of lamina papyracea."
"stage IV: orbital abscess and purulent collection within orbit."
"stage V: cavernous sinus thrombosis after posterior extension of the infection through the superior ophthalmic veins."