<prompt> Opening in Caldwell-Luc operation is made in which of the following?Middle meatusInferior meatusCanine fossaDental sulcus  <response>: Ans. c Canine fossa. Ref Diseases of ENT by PL Dhingra,3rd ed., 475; Bhargava, 188CALDWELL-LUC OPERATIONSite of incisionOver anterior wail of antrum in the region of canine fossa.It is the process of opening maxillary antrum through canine fossa by sub-labial approach.ContraindicatedBelow 17 years of age.indications1.Chronic sinusitisMnemonic.; COFFEE BOARD2.Oro antral fistula3.Fungal sinusitis 4.Foreign body in maxilla 5.Ethmoidectomy 6.Elevation of orbital floor fracture 7.Biopsy benign and rarely malignant conditions 8.Opening of posterior wall of maxilla so as to ligate maxillary artery 9.AC polyp 10.Reducing fracture maxilla 11.Dentigerous cystComplicationsPain and paraesthesiaMnemonic -POP SHOOTOrbital cellulitisSwelling Hemorrhage Oroantral fistula Osteomyelitis of maxilla Tooth root injury Anaesthesia of cheek due to stretching of Infraorbital nerve is common and persists for few weeks or months following Caldwell Luc operation. 