Commonest site of Ivory osteoma is
Osteoma: They are most commonly seen in the frontal sinus followed in turn by those of ethmoid and maxillary. They may remain asymptomatic, being discovered incidentally on X-rays. Ref: Textbook of ENT, Dhingra; 6th edition; Pg no: 205 ref img
Frontal-Ethmodial region
Mandible
Maxilla
Spheroid
Miscellaneous ENT