Left first MTP joint mass, suspicious for ganglion cyst. A marker was placed on the skin dorsal to the neck of the first metatarsal. There is a lobulated mass of near-fluid signal intensity situated deep to this marker, along the lateral aspect of the extensor tendon extending inferiorly along the lateral margin of the first metatarsal head/neck. I see no appreciable enhancement of the mass. In total, it is approximately 1.5 x 0.7 cm in cross-section, and approximately 0.7 cm in longitudinal dimension. It does not appear to erode underlying bone. I see no additional soft tissue masses. Mild osteoarthritis affects the first metatarsophalangeal joint. I see no abnormal enhancement.
Findings compatible with a ganglion as described above.