Figure 14b. Clear cell chondrosarcoma in the left proximal femur of a 30-year-old man with hip pain. (a) Anteroposterior hip radiograph demonstrates a lytic lesion of the left proximal femoral metaepiphysis with a medial sclerotic margin (black arrows) and a small area of sclerosis (white arrow) that could represent matrix mineralization. (b) Axial CT scan clearly demonstrates central flocculent calcification (white arrow) and sclerotic margin (black arrows). (c, d) Axial T1-weighted (500/25) (c) and coronal T2-weighted (2,500/90) (d) MR images show marrow replacement (*), which has high signal intensity on the long repetition time image (* in d) and a central area of low signal intensity corresponding to central calcification (arrow). No edema is noted surrounding the lesion. (e) Photograph of the coronally sectioned gross specimen shows the medullary lesion with prominent areas of hemorrhage (H).