<prompt> Which of the following is a differential of giant cell tumor?Ossifying fibromaNon-ossifying fibromaOsteogenic sarcomaChondroblastoma  <response>: Eccentric lytic lesion with no calcification is the commonest differential. Calcification: Ossifying fibroma, chondroblastoma osteosarcoma hence non-ossifying fibroma is a preferred answer here. Non-ossifying fibroma Benign non-cancerous Eccentric Age 15 years Non-aggressivetumor Metaphyseal lesion Sclerotic margin Histologically Giant cell with foam cell Note: Closest differential is ABC. 