tenosynovial giant cell tumor ( RID4309 )
Predominantly dark signal nodular masses of the small finger flexor tendon sheath are most obvious. Smaller more heterogenous signal mass of the FPL tendon sheath is seen in the proximal thumb. There is extensive heterogenous signal nodular synovitis of the common flexor tendon sheath. Would this be considered multifocal (which is rare), or just diffuse, communicating from the common flexor tendon sheath?
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