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Age / Sex : 38 / M
C.C : Rt. ankle pain for 5 days since Rt. ankle sprain
What is your diagnosis?
Two weeks later, you can see the final diagonosis with a brief discussion of this case (Please submit only one answer)
Courtesy : 이인숙 (In Sook Lee), 부산대병원 (Pusan National University Hospital)
Diagnosis: OS supranavicularae
Discussion
Disease Review
1. An accessory ossicle located at the proximal dorsal aspect of the navicular bone or talonavicular joint
2. Derived from the failure of union of secondary ossification centers adjacent to the main bony mass
3. Considered a normal variant in most cases, but may become symptomatic due to the occurrence of navicular stress fractures
- A pre-existing dorsal cortical notch accompanying an os supranaviculare, may contribute to concentrating bone stress on the dorsal aspect of the navicular bone
4. May be misdiagnosed as the cortical avulsion fracture of the talonavicular capsule
References
Accessory ossicles and sesamoid bones of the ankle and foot: imaging findings, clinical significance and differential diagnosis.
European radiology 13 (2003): L164-L177.
Common accessory ossicles of the foot: imaging features, pitfalls and associated pathology.
Singapore medical journal 59.4 (2018): 183.
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