Figure 1.

(A) Tenosynovial giant cell tumor (TSGCT) of the right flexor hallucis longus, imaging appearance with MRI in sagittal projection, showing gadolinium-enhancement due to the abundance of capillaries in the collagenous stroma (white arrow); (B) TSGCT of the ankle with aggressive behavior in a 56-year-old female; imaging appearance at MRI with extensive bone and soft tissue involvement (C) Recurrence 12 years after treatment of TSGCT of the foot in 34-year old female patient (white arrows). (D) High power view of a TSGCT, localized type: osteoclast-like giant cells, abundant mononuclear cells, and hemosiderin pigment in the top left.