Female 56 years old with tenderness palpation of the right foot. Assess soft tissue mass in right foot. There is a multilobulated lesion within the septations in the soft tissues overlying the talus and medial cuneiform bones and medial to the extensor digitorum tendon. The lesion measures 2.3 x 1.6 x 3.9 cm (series 1201, image 13 and series 1101, image 12). It is low in signal intensity on T1 and high on T2-weighted image. There is mild peripheral contrast enhancement but no enhancement of the septations. A 5 mm ossicle posterior to the talocalcaneal articulation compatible with an os trigonum. Bone marrow signal intensity is within normal limits. There is no fracture, dislocation tibiotalar joint effusion. The Achilles tendon is normal in appearance. The flexor and extensor tendons are intact. The ligamentous structures appear intact.
2.3 x 1.6 x 3.9 cm lesion in the anterior soft tissues of the ankle is most compatible with a ganglion cyst.