Figure 5. (a) Anteroposterior and (b) lateral radiographs of the femur. The features are those of a well-differentiated/low grade cartilaginous tumour, with chondral-type matrix mineralization and endosteal scalloping (arrows). Histology confirmed a chondrosarcoma, but enchondromas in long bones appear identical. (c) Coronal T₁ weighted MR image showing the hypointense lobular chondral tumour. (d) Coronal short tau inversion recovery (STIR) MR image shows a high signal lobular tumour, with small foci of contained signal void due to matrix mineralization. Uncalcified hyaline cartilage typically shows marked hyperintensity on T₂ and STIR images. Diagnosis: low grade chondrosarcoma.