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Fig. 4 —Cadaver of 78-year-old woman with communicating foramen. Endoscopic image obtained from inside of extensor pollicis longus (EPL) tendon sheath shows EPL tendon as it crosses over extensor carpi tendons. Edge of foramen (arrows) is in foreground. ECRB = extensor carpi radialis brevis tendon, ECRL = extensor carpi radialis longus tendon.