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There is signal abnormality of the tendon sheath of the extensor carpi radials longus (ECRL), extensor carpi radialis brevis (ECRB), and extensor pollicis longus (EPL), reflecting the synovial sheath thickening and effusion with a significant post contrast injection enhancement. Intrasubstance high signal of the EPL is also appreciated. These lesions are confined distally along the course of the EPL where it crosses over the ECRL & ECRB at the level and distal to Lister's tubercle. Note the prominence of Lister's tubercle and the supernumerary tubercle between the ECRB and ECRL.