Sesamoid bone of the popliteus muscle (cyamella) with mild seasmoiditis and popliteus tendonitis

Case contributed by Dr Mohamed Hossam el Deen


History of left knee pain of intermittent course over the last year.

Patient Data

Age: 54
Gender: Male

There is a sesamoid  bone in the popliteus muscle tendon measuring 8 mm in the largest dimension ( Cyamella ) . On STIR images there is mild bone marrow edema that may represents inflammatory changes " sesamoiditis ". Mild popliteus tendonitis is noted with mild thickening and intermediate signal intensity.  Mild knee joint effusion is also noted. No internal derangement.

Case Discussion

Cyamella is a sesamoid bone commonly located in the vicinity of the proximal musculo tendinous junction. It is commonly seen in small mammals " cats and dogs " and rarely found in humans .

PlayAdd to Share

Case information

rID: 38779
Case created: 3rd Aug 2015
Last edited: 1st Sep 2015
Inclusion in quiz mode: Included

Updating… Please wait.

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.