Os styloideum is an accessory ossicle located dorsally on the wrist that represents an anatomic variant. Association between the os styloideum and wrist pain is clinically known as "carpal boss syndrome". The authors report a case of bone marrow edema in the os styloideum diagnosed by magnetic resonance imaging in a young tennis player, and present a literature review on this finding.
Os styloideum; Bone marrow edema; Magnetic resonance imaging
