Orbital cellulitis can complicate acute ethmoiditis if anterior and posterior ethmoidal veins thrombophlebitis enables the spread of the infection to the lateral or orbital side of the ethmoid labyrinth.
2.
Ethmoiditis refers to an infection in the ethmoid sinus cavity / ies, frontal sinusitis refers to an infection occurring in the frontal sinus cavity / ies, antritis is used to refer to an infection in the maxillary sinus cavity / ies whilst spenoiditis refers to an infection in the sphenoid sinus cavity / ies.
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