| Summary: | Sesamoid bones and accessory ossicles are normal anatomic variants with varying morphological
appearances and incidences. They are usually small osseous fragments with well-corticated margins
located adjacent to the joint space and bone. Patients with sesamoid bones and accessory
ossicles are usually asymptomatic and commonly encountered in clinical practice. These sesamoids
and accessory bones are occasionally painful because of fractures, dislocations, degenerative
changes, avascular necrosis, accessory bone infections, or abnormalities of the adjacent tissue,
such as nerve entrapment, tenosynovitis, or soft tissue impingement. This article aimed to
illustrate the imaging features of symptomatic sesamoids bones and accessory ossicles at various
anatomic locations and describe their clinical features and radiological differential diagnosis.
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