<prompt> Radiological inv. shows sun ray appearance; dx is:OsteosarcomaGCTOsteomyelitisEwings sarcoma  <response>: Ans. is a ie Osteosarcoma Classical radiological featuresSun ray appearance-OsteosarcomaOnion peel appearance-EwingSoap bubble appearance-OsteoclastomaPatchy calcification-ChondrosarcomaWormian bones-Osteogenesis imperfectaTrethowans sign-Stipped capital femoral epiphysisAneurysmal sign-TB spine. 