Sesamoid bone of the popliteus muscle (cyamella) with mild seasmoiditis and popliteus tendonitis
History of left knee pain of intermittent course over the last year.
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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.
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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 .
- Dykes MI, Vijay RK. Sesamoiditis of the cyamella: imaging features of this rare presentation. Jpn J Radiol. 2014;32 (2): 105-8. doi:10.1007/s11604-013-0269-6 - Pubmed citation
- Akansel G, Inan N, Sarisoy HT et-al. Popliteus muscle sesamoid bone (cyamella): appearance on radiographs, CT and MRI. Surg Radiol Anat. 2006;28 (6): 642-5. doi:10.1007/s00276-006-0134-8 - Pubmed citation