Fig. 12

Desmoplastic fibroblastoma in a 40-year-old female who presented with a swelling of 3-month duration over the dorsum of the first web space of the right hand. (a) T1w sequence shows a lobulated lesion of very low signal within the first dorsal interosseous muscle with loss of surrounding fat planes. (b) The lesion is also of low signal on T2w-FS sequence reflecting a dense fibrous component (arrow). (c) There is heterogeneous predominantly peripheral enhancement (arrow). The lesion encases the index finger extensor tendon (arrowhead)