The lesion located within the first metacarpal demonstrates predominantly high fluid signal intensity with low T1 signal, and scattered areas of low/low signal intensity. It is well defined without surrounding edema, and does not violate the cotex.
There is also a large fat-signal intensity lesion anterior to the first metacarpal that extends between the opponens pollicus and flexor pollicis brevis. This lesion demonstrates no concerning septal thickening or enhancement, althoug pre-contrast T1 fat sat images would ideally be included for a confident diagnosis of benignity. The transverse low T1 high STIR signal band that spans the first metacarpal from the medial to the lateral apects of the lipomatous mass is somewhat disconserting, but does not enhance.
Lunotriquetral coalition is again noted.