From the case:
Distal intersection syndrome illustration
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The image depicts tenosynovitis of the EPL as it crosses over the 2nd dorsal carpal compartment. just distal to Lister's tubercle.
Case Discussion
Tenosynovitis isolated to the extensor pollicis longus (EPL) tendon in compartment 3 as it passes over the compartment 2 tendons (ECRL and ECRB) is known as distal intersection syndrome.