<prompt> Most common sire for osteoma is:Maxillary sinusEthmoid sinusFrontal sinusSphenoid sinus  <response>: Craniofacial osteomas are begin tumors often originating in the paranasal sinuses. The frontal sinus is the most frequent location followed by the ethmoid,Maxillary and sphenoid sinus,respectively Age of presentationsecond to fifth decade with a male-female ratio-3:1. Ref .Scott Brown 7e,Vol 2,p 1521. 