Giant cell tumor of tendon sheath is a common tumor of the hand. Magne
tic resonance can be used to confirm its presence, as well as characte
rize and determine its extent, contributing to the presurgical diagnos
is, planning of the surgical approach, and diagnosis of recurrence. Th
e authors describe the MR appearances in three cases, using spin-echo
sequences with and without fat saturation and intravenous gadopentetat
e dimeglumine administration. Previous literature on the subject is al
so reviewed.