<prompt> Onion peel appearance is seen in-Ewings sarcomaChondroblastomaOsteosarcomaFibrosarcoma  <response>: Ans. is a i.e., Ewings sarcoma Onion - peel periosteal reaction is characteristically seen in Ewings sarcoma. Note - Onion peel periosteal reaction may also be seen rarely in osteosarcoma.Other Radiological features of Ewings sarcoma Diaphyseal Mottled or moth eaten lesion Sunray appearance More common with osteosarcoma Codmans triangle More common with osteosarcoma 