Giant cell tumor of the tendon sheath
Left wrist pain and swelling.
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The mass partially encircles the scaphoid, extending dorsally deep to the first extensor compartment. There is ulnar volar extension between the FCR and flexor pollicis longus tendons at the distal margin of the carpal tunnel.
There is intra-osseous extension of the mass into the volar tubercle of the radius.
Giant cell-rich lesion is consistent with giant cell tumor of the tendon sheath.