Right thumb mass Note that a marker was placed along the volar aspect of the thumb at the metacarpophalangeal joint. Just deep to this marker there is a small mass of near fluid signal intensity which measures 6 x 3 x 3 mm in the greatest transverse and longitudinal dimensions. The mass is situated adjacent to the volar aspect of the flexor pollicis longus with a small tail of fluid signal intensity extending into the tendon. This mass does not demonstrate enhancement although there is mild associated edema within the surrounding soft tissues. There is increased signal and thickening of the flexor pollicis longus tendon at this location, which is also noted to overlie the ulnar sesamoid. A small curvilinear collection of fluid signal is noted along the dorsal and ulnar aspect of the first metatarsal head that may represent joint fluid or perhaps a ganglion. Additionally, there is a lobulated collection noted between the base of the second metacarpal and distal trapezium which may represent a synovial cyst or small ganglion.The radial and ulnar collateral ligaments are intact.There is mild arthrosis of the interphalangeal joint with a mild to moderate changes noted at the basilar joint.
Findings compatible with a small ganglion measuring 6 x 3 x 3 mm arising from a degenerated flexor pollicis longus tendon at the level of the MCP joint, likely corresponding to the mass in question. Additional findings described above.