<prompt> MC malignancy of maxillary antrum:Muco-epidermoid CarcinomaAdeno-cystic CarcinomaAdenoCarcinomaSquamous cell Carcinoma  <response>: Mc malignancy of paranasal sinus and nasal cavity -Squamous cell Carcinoma Most common PNS involved - maxillary sinus Aw occupation Furniture industry - Adeno ca Nickel industry - Sq cell ca. 