There is a well-defined soft tissue calcification (4 x 4 x 3 mm) on the volar side of the MCP joint which correlates with the site of tenderness. It is located radial to the midline and distal to the sesamoid bone. There is local subcutaneous edema and hypervascularity. The radial and ulnar collateral ligaments are normal. The flexor tendon is normal without tenosynovitis. The extensor tendon is intact. There is no effusion involving MCP joint. The neurovascular bundles of the thumb are normal.