The palpable nodule revealed to be an anechoic, thin-walled avascular cyst (3 x 2 mm), abutting the palmar aspect of the flexor tendon. Acoustic enhancement is present. It overlies mid-shaft of the proximal phalanx. The axial view shows adjacent A2 pulley.
The flexor tendon shows normal echopattern without tenosynovitis. Dynamic scan showed free tendon movement. There is no MCP or IP joint effusion.