<prompt> Which among the following sinus is affected in children most commonly:SphenoidEthmoidFrontalMaxillary  <response>: Acute ethmoid sinusitis Aetiology Acute ethmoiditis is often associated with infection of other sinuses. Ethmoid sinuses are more often involved in infants and young children. Ref: Diseases of ENT, PL Dhingra, 7th edition, of no. 216 