<prompt> Orbital cellulitis most commonly occurs after which sinus infection?MaxillaryFrontalEthmoidalSphenoidal  <response>: ANSWER: C EthmoidalREF: Dhingra 4th ed p, 182,190However orbital cellulitis can be a complication of maxillary, frontal and Ethmoid sinusitis, Orbital cellulitis is an early complication in Ethmoid sinusitis and hence most common. 