Flexor 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 flexor tendons.

• Pain and palpable swelling occurs at the affected area.

• 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).