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There is an echogenic focus (about 3 mm) with reverberation artifact below the extensor carpi radialis brevis tendon. Color Doppler shows a twinkling artifact with a very high PRF.
It is about 12 - 14 mm distal to the radio-carpal joint. It is distal to the scaphoid and overlies the distal row of the carpal bones. It abuts the deeper surface of the tendon.
There is no tenosynovitis. There is no foreign body granuloma.