<prompt> The most common site of origin of ameloblastoma is:Mandible near molar toothMiddle alveolar marginsHard palateMandible near symphisis menti.  <response>: Ans. is a i.e. Mandible near molar tooth Ref. S. Das short cases of Sx, p 115; S. Das a concise textbook of 3e, p567 Ameloblastoma occurs most often in the mandible in the area of the molars. It is an epithelial tumor arising from ameloblast enamel-forming cells. Pathologically it behaves like a basal cell carcinoma i.e., it is a malignant tumor which is locally invasive but does not metastasize. It causes expansion mostly of the outer table so the swelling is more evident from outside than from inside of mouth. Cystic degeneration leads to the area of softening and egg - shell crackling on palpation. x-ray: Honeycomb appearance tt: Since it is a locally malignant tumor, a simple enucleation and curettage will invariably lead to recurrences. Radiotherapy is ineffective. Therefore resection of the tumor along with a margin of healthy bone is essential permanent cure. If the tumor is very large affecting the major part of the mandible, hemi mandibulectomy may be necessary. Other Sites Of Ameloblastoma: In the stalk of pituitary where it is known as a suprasellar tumor In the tibia 