A 17 year old male presented with psychotic symptoms, trichotillomania and intellectual disability and likely FASD . On routine CT scan he was found to have a large fibro- osseous growth extending from the pterigoid process , sphenoid sinus to zygomatic bone, which was asymptomatic. He also was born with atrial septal defect and had reconstructive surgery. What would be the etiopathology of such finding and what would be it’s prognosis.