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Abnormal intrasubstance increased signal and surrounding oedema is seen along the course of extensor pollicis longus (EPL) when crossing the extensor carpi radialis longus (ECRL) and extensor carpi radialis brevis (ECRB) tendons associated with ECRL and ECRB tenosynovitis.
A skin marker has been placed by the technologist to indicate the location of the patient's wrist pain.