The axial inversion recovery-weighted image obtained at the level of the pisotriquetral joint shows fluid intensity signal distending the tendon sheaths of the extensor pollicis longus (EPL), extensor carpi radialis longus (ECRL) and extensor carpi radialis brevis (ECRB). Stranded hypointense material in the paratenon is consistent with synovial hypertrophy due to tenosynovitis. A skin marker has been placed by the technologist to indicate the location of the patient's palpable abnormality.
The coronal inversion recovery-weighted image visualizes the skin marker directly over the intersection of the extensor pollicis longus (EPL) and extensor carpi radialis brevis (ECRB). Tenosynovitis is again seen, with fluid intensity signal distending the paratenons and internal synovial hypertrophy. Note the angulation of the extensor pollicis longus tendon as it crosses Lister's tubercle (asterisk), which acts as a mechanical pulley for the tendon.
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