Fig. 4a.

X-ray (a) AP (b) lateral shows expansile mixed lytic and sclerotic lesion in lower meta-diaphyses of femur with a broad zone of transition, (arrow) showing codman's triangle. There is cumulus cloud formation: Osteosarcoma. MRI (c & d) T2 FAT SAT coronal, (e) coronal T1W reveal mixed intensity mass lesion in distal femur with extension into overlying soft tissue, (f) SWI Images showing areas of blooming. There is involvement of the epiphysis and articular margin of femur. Skip lesion is seen in proximal femur upper shaft (arrow). DWI & ADC(g) images show restriction in the soft tissue with reversal of signal on ADC.