Akzessorischer Knochen

X-ray of the

right foot by lateral projection, with shapes representing where common accessory and sesamoid bones would be, colored by their prevalences, and with representative shapes.

Wikipedia • CC0

Ossa

suprasternalia: seltene akzessorische Ossikel oberhalb des Manubrium sterni. (Der Knoten rechts paratracheal gehört zu einer großen Struma.)

Wikipedia • CC BY-SA 4.0

X-ray of the

left wrist, with areas representing where common accessory bones would be, colored by their prevalences, and with representative shapes.

Wikipedia • CC0

Os centrale

im Röntgenbild bei einem Kind.

Wikipedia • CC BY-SA 4.0

Os

odontoideum als Zufallsbefund. Kein Trauma in der Vorgeschichte bekannt. CT sagittal rekonstruiert.

Wikipedia • CC BY-SA 3.0

Os vesalianum

pedis • Accessory ossicles of the foot (illustration) - Ganzer Fall bei Radiopaedia

Murphy A, Accessory ossicles of the foot (illustration). Case study, Radiopaedia.org (Accessed on 27 Jan 2023) https://doi.org/10.53347/rID-99467 • CC by-nc-sa 3.0 (modified)

Accessory

ossicles of the foot • Accessory ossicles of the foot - Ganzer Fall bei Radiopaedia

Benoudina S, Accessory ossicles of the foot. Case study, Radiopaedia.org (Accessed on 21 Jan 2023) https://doi.org/10.53347/rID-42731 • CC by-nc-sa 3.0 (modified)

Accessory

ossicles • Fabella - Ganzer Fall bei Radiopaedia

Knipe H, Fabella. Case study, Radiopaedia.org (Accessed on 07 Apr 2024) https://doi.org/10.53347/rID-25793 • CC by-nc-sa 3.0 (modified)

Os triangulare

• Os triangulare - Ganzer Fall bei Radiopaedia

Knipe H, Os triangulare. Case study, Radiopaedia.org (Accessed on 25 Nov 2022) https://doi.org/10.53347/rID-25054 • CC by-nc-sa 3.0 (modified)

Accessory

ossicles of the foot • Os trigonum - Ganzer Fall bei Radiopaedia

Jones J, Os trigonum. Case study, Radiopaedia.org (Accessed on 21 Jan 2023) https://doi.org/10.53347/rID-10195 • CC by-nc-sa 3.0 (modified)

Accessory

ossicles • Os subepicondylare mediale - Ganzer Fall bei Radiopaedia

Bell D, Os subepicondylare mediale. Case study, Radiopaedia.org (Accessed on 07 Apr 2024) https://doi.org/10.53347/rID-100170 • CC by-nc-sa 3.0 (modified)

Accessory

ossicles • Os intermetatarseum and os calcaneus secundarius - Ganzer Fall bei Radiopaedia

Behnke N, Os intermetatarseum and os calcaneus secundarius. Case study, Radiopaedia.org (Accessed on 07 Apr 2024) https://doi.org/10.53347/rID-174445 • CC by-nc-sa 3.0 (modified)

Radiopaedia • CC-by-nc-sa 3.0 • de

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 .

The significance of accessory ossicles is their potential to mimic avulsion fractures.