<prompt> A midline protrusion in maxillary region is mostly due toTorus palatinusTorus maxillarisTorus mandibularisTorus tubarius  <response>: Torus means an elevation. Different types according to location: Torus palatinus: - Midline elevation of exaggerated bony growth at intermaxillary suture region specifically in the midline Torus maxillaris: - Exaggerated bony growth at either inner side of alveolar process or at outer side of alveolar process either side of teeth Torus mandibularis: - Exaggerated bony growth - near the premolar above the mylohyoid line. Torus tubaris: - Mucosal elevation in nasopharynx at opening of the eustachian tube. 