Fig. 19

Low-grade chondrosarcoma in a 47-year-old female presenting with a slowly enlarging firm swelling over the distal phalanx of the left little finger for several months with nail deformity. (a) Plain radiograph shows an expansile lytic bony lesion in the distal phalanx of the little finger with marked endosteal scalloping and thinning with disruption of the dorsal cortex. Ring-and-arc densities are suggestive of chondroid matrix (arrows). (b) T1w sequence shows an expansile bony lesion in the little finger distal phalanx of intermediate signal, with a soft tissue component destroying and breaking through the dorsal cortex to involve the skin and nailbed. (c) The lesion is very hyperintense on T2w-FS sequence with hypointense areas (arrow), typical of a chondroid matrix. (d) Post-contrast there is heterogeneous enhancement