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