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 lateral view.

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


Lower limb anatomy
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Article Information

rID: 25083
Section: Anatomy
Synonyms or Alternate Spellings:
  • Popliteal sesamoid bone
  • Sesamoid bone of the popliteus muscle

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