Wrist extensor tendon sheath

Cause, clinical and ultrasound findings

• Inflammatory arthritis or chronic overuse due to occupational or athletic activities may cause tendinopathy or tenosynovitis of the extensor wrist tendons. Common sites of the disease include compartment I (de Quervain’s tenosynovitis), the compartment I and II intersection area (intersection syndrome) and compartment VI at the level of the ulnar head.

• Pain and palpable swelling at the affected area may be noted.

• The tendon sheath is distended with fluid (tenosynovitis). A hypoechoic appearance is typical, and synovial tissue with or without neovascularity may be seen in and around the tendon (tendinopathy).