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Fig. 1. —27-year-old woman with history of prior resection of giant cell tumor who presented with recurrent mass in distal thumb. Longitudinal sonogram of volar surface of thumb at level of distal interphalangeal joint shows 4.5 x 2.0 mm solid, homogeneous, hypoechoic mass (cursors) adjacent to insertion of flexor pollicis longus tendon (T). Also seen is proximal (P) and distal (D) phalanx.