<prompt> Antrochoanal polyp opens In which meantMiddle meatusSuperior meatusInferior meatusSphenoethmoidal recess  <response>: ANTROCHOANAL POLYP most commonly seen in children.They are unilateral, usually arises from the mucosa of maxillary antrum near its accessory ostium comes out of it grows in the channel nasal cavity.Maxillary sinus opens into the middle meatus. 