The os styloideum is an ununited bony protuberance, located on the dorsum of the wrist at the base of the second and third metacarpals. The association between dorsal wrist pain or fatigability and an os styloideum is known as carpal bossing (carpe bossu disease). There is an accessory ossicle between capitate and trapezoid with marrow edema in the ossicle and trapezoid. This may indicate a symptomatic os styloideum.
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