<prompt> Antrochoanal polyp opens In which meatus:Middle meatusSuperior meatusInferior meatusSphenoethmoidal recess  <response>: Ans: A Middle Meatus Ref: Dhingras ENT 6th ed. 173-75 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 chonna nasal cavity. Maxillary sinus opens into the middle meatus. 