chondroblastoma femur

Pitfalls in

the diagnosis of common benign bone tumours in children. Typical chondroblastoma of the distal femoral epiphysis: a Frontal X-ray of the right knee: well-defined round osteolytic lesion of the distal femoral epiphysis (arrow). b Sagittal fat-saturated proton density MRI: the lesion is well defined, mostly hyperintense, surrounded by bone oedema and an inflammatory reaction of the adjoining soft tissues. c CT of the right knee: the cortex is interrupted on the posterior border of the lesion (arrow), but no periosteal reaction is identified