Last revised by Yahya Baba on 07 Jan 2021

A cyamella is a rare sesamoid bone that exists as a normal variant within the popliteus tendon, characteristically located at the lateral aspect of the distal femur in the popliteal groove.

Cyamella is best seen on the AP view of plain radiograph as opposed to fabella, which is best appreciated on the lateral view.

It is seen more commonly in less advanced primates 3 and in a high proportion of dogs 4.

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Cases and figures

  • Case 1
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  • Case 2
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  • Case 3
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