Accessory ossicles are secondary ossification centers that remain separate from the adjacent bone. They are usually round or ovoid in shape, occur in typical locations and have well-defined smooth cortical margins on all sides.
In most cases, they are congenital in origin, although they may occur as a result of trauma or local degenerative disease 2.
The significance of accessory ossicles is their potential to mimic avulsion fractures.
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accessory ossicles of the wrist
trapezium secondarium
epilunate
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accessory ossicles of the spine
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accessory ossicles of the hip
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accessory ossicles of the knee
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