<prompt> Caldwell lucs operation is done for:Frontal sinusitisMaxillay sinusitisEthmoid sinusitisSphenoid sinusitis  <response>: Ans. b Maxillay sinusitisRef: Dhingras ENT 6th ed 411-12Most common sinus involved in sinusitis: Maxillary sinus aka Antrum of HighmooreTreatment of Acute cases is by antibiotics and symptomatic.Chronic cases and recurrent cases are treated by surgery. Usually performed surgeries are: Antral wash Caldwell-Luc operation FESS Functional Endoscopic Sinus Surgery- Most preferred currently. Best surgical optionCaldwell Luc operation Indications:Technique: In case of chronic maxillary sinusitis Dental cyst or Oro-antral fistula Fracture of maxilla or blow out fracture of orbit Antrochoanal polyp Horizontal Incision below gingivolabial sulcus Elevation of flap a Opening of Antrum a Removal of deseased antral mucosapolyp Making of naso-antral window Packing the antrum a Closure of wound 