de Quervain tendinopathy transverse ultrasound

This transverse view of the first wrist compartment, just distal to the radiocarpal joint, shows significant swelling (hypoechoic - ie, black - regions surrounding tendons) consistent with de Quervain tendinopathy. The abductor pollicis brevis (APB) is indicated by the arrow. In about 75 percent of cases, the APB divides into accessory tendons.