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Fig. 3. 21-year-old woman with enlarging mass over proximal phalanx
of thumb. Longitudinal sonogram of volar surface of thumb shows solid,
homogeneous, hypoechoic mass (cursors) adjacent to superficial and
deep surface of flexor pollicis longus tendon (T). Erosion (arrows)
is seen along distal aspect of proximal phalanx.