Case 183

 A sixty nine-year-old female presented in our hospital for repeated painful left ankle joint when beginning to walk. She gradually came to feel painless while walking. Approximately one month before, she felt pain at medial posterior region of left ankle joint, where it was swollen sized pachinko ball and as hard as bone protrusion. No tenderness on tarsal canal. She took right ankle radiograph and MRI.

What is your diagnosis ?

1.　Hyper-exostosis

2.　Bone tumor

3.　Dissecting bone fracture

4.　Trigonal bone

5.　Foreign body

answer

2020.3.11