Clinical presentation
35 year old lady with twist injury to the ankle and secondary swelling
MRI
Findings
Accessory navicular bone measuring 12 x 9 mm present to which the tibialis posterior tendon inserts. Insertional tendinous PD hyperintense signal with minimal fluid in tenosynovial sheath. Diffuse marrow edema in subchondral margins of navicular – accessory navicular articulation. Minimal fluid in ankle joint. Rest of the ankle study is normal.
Learning points
- Seen in 10% of the population.
- Common in adolescents.
- Common in females.
- Responsible for medial foot pain