Os styloideum


The os styloideum is an accessory ossicle of the wrist, situated between the 2and 3metacarpal bases.
Radiographic appearance
Given its position next to the 2 and 3 metacarpal bases, it may be mistaken for a fracture, though this should not occur if an adequate lateral radiograph is assessed .
Related pathology
It may be implicated in degenerative conditions such as osteoarthritis with localized pain occurring at this region .
Differential diagnosis
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