Fig. 3

Fibroma of the tendon sheath in a 51-year-old female presenting with a 6-month history of a lump in the left hand over the thenar eminence near the first metacarpal base. (a) T1w sequence shows a lobulated mass deep to the thenar musculature. It is slightly hyperintense to muscle, which is unusual. (b) The lesion is heterogeneously hyperintense on T2w-FS sequence with low signal areas indicating a fibrous component (arrow). The lesion abuts but does not involve the trapezium (arrowhead). (c) A small eccentric focus of enhancement (arrow) is seen with no other areas of significant internal enhancement