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Figure 1 .
(A) Ultrasonographic transverse image of the symptomatic tendons of the abductor pollicis longus and the extensor pollicis brevis, showing a diffuse circumferential hypoechoic thickening of the synovial sheath (0.27 cm), giving a characteristic double target pattern, denoting de Quervain's tenosynovitis; (B) ultrasound transverse scans of the same patient. After one week of injection, note the decrease in thickening of the synovial sheath (0.17 cm). T, tendon; RSP, radial styloid process. 11 MHz.