Popliteus muscle sesamoid bone (cyamella): appearance on radiographs, CT and MRI

Akansel, Gür; İnan, Nagihan; Sarisoy, Hasan Tahsin; Anık, Yonca; Akansel, Sertac

doi:10.1007/s00276-006-0134-8

Cited by 21 publications

(15 citation statements)

References 7 publications

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“…Bone-marrow signal or the presence of soft tissue can also help differentiate this condition from aggressive, malignant processes such as osteosarcoma. A survey of the remainder of the knee joint, in addition to MR signal characteristics, can help evaluate the likelihood of other etiologies such as osteocartilaginous loose bodies, osteochondromatosis, or the presence of ostephytosis (if there is a concern for a detached osteophyte) ( 5 ). With this range of potential differentiating features, multiple modalities including CT, MR, and radiography can all play overlapping, as well as complementary, roles in establishing the rare diagnosis of cyamella.…”

Section: Discussionmentioning

confidence: 99%

The cyamella, a lost sesamoid: Normal variant or posterolateral corner anomaly?

Khanna

Maldjian

2014

Radiology Case Reports

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Cyamella, an accessory sesamoid ossicle of the popliteus in the region of the proximal myotendinous junction, is an extremely unusual finding, with a paucity of current published literature describing its MR appearance. In this case study, we describe MRI findings in a 44-year-old female presenting with pain after a stretching workout. Bone edema in the cyamella, edema in the myotendinous portion of the popliteus, and pericapsular edema at the posterolateral corner were identified. While commonly seen in certain mammalian species, cyamella is rare in humans. The upright walking posture of humans requires posterolateral corner structures to play a greater role in structural support and weight-bearing. We hypothesize that the cyamella, while intrinsic to certain mammalian species, may interfere with these biomechanical functions in upright walking posture, thereby predisposing to isolated injury of the posterolateral corner in humans.

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Section: Discussionmentioning

confidence: 99%

The cyamella, a lost sesamoid: Normal variant or posterolateral corner anomaly?

Khanna

Maldjian

2014

Radiology Case Reports

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“…Avulsion of the tendon at the femoral attachment can occur, and the presence or absence of an attached osseous fragment should be reported, as this may alter the surgical technique used. A cyamella, a rare sesamoid bone found in the popliteus tendon, should not be mistaken for an avulsion fracture or fabella (16).…”

Section: Popliteus Musculotendinous Complexmentioning

confidence: 99%

Unraveling the Posterolateral Corner of the Knee

Rosas¹

2016

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Although rare, posterolateral corner (PLC) injuries can result in sustained instability and failed cruciate ligament reconstruction if they are not diagnosed. The anatomy of the PLC was once thought to be perplexing and esoteric-in part because of the varying nomenclature applied to this region in the literature, which added unnecessary complexity. More recently, three major structures have been described as the primary stabilizers of the PLC on the basis of biomechanical study findings: the lateral collateral ligament, popliteus tendon, and popliteofibular ligament. An understanding of the anatomic relationships of these structures with each other and with the surrounding osseous structures is invaluable for improving the diagnostic accuracy of magnetic resonance (MR) imaging in the detection of PLC injuries and allowing a structured and systematic approach when interpreting the imaging findings. The majority of PLC injuries do not occur in isolation and are part of a more complex injury pattern that typically involves other vital supporting structures such as the cruciate ligaments, menisci, and medial ligamentous structures. Therefore, imaging has an ever-increasing role in the recognition of these injuries, as the clinical findings may be difficult to interpret adequately owing to synchronous injuries that dominate the physical examination findings. Furthermore, the diagnosis of acute high-grade PLC injuries is critical because early and aggressive treatment, for which surgical reconstruction is often required, leads to improved long-term outcomes and the prevention of persistent instability that would otherwise result in varus thrust gait, chronic pain, and accelerated cartilage damage. RSNA, 2016.

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“…Isolated case reports include the imaging appearance of cyamella. CT showed cyamella to be a well-corticated ossicle with a hypodense center due to the presence of marrow fat [13]. On T1-, T2-, and T2*-weighted MRI scans, a cyamella presents as an ossicle with low signal intensity along its borders [14].…”

Section: Discussionmentioning

confidence: 99%

A symptomatic cyamella in the popliteus tendon causing snapping knee: a case report and literature review

Chen

et al. 2019

BMC Musculoskelet Disord

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BackgroundCyamella,the sesamoid bones of the popliteus muscle, are rare in humans. Snapping knee is an uncommon problem which can be difficult to diagnose.Case presentationIn this case, we report a 24-year-old male with snapping knee caused by symptomatic cyamella in the popliteus tendon. A large cyamella was identified upon surgery and was removed. Postoperatively, the patient had immediate relief of preoperative symptoms, and there were no signs of recurrence after 1 years of follow-up.ConclusionsAlthough not previously suggested, symptomatic cyamella in the popliteus tendon should be considered as part of the differential diagnosis of the snapping knee.

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Popliteus muscle sesamoid bone (cyamella): appearance on radiographs, CT and MRI

Cited by 21 publications

References 7 publications

The cyamella, a lost sesamoid: Normal variant or posterolateral corner anomaly?

The cyamella, a lost sesamoid: Normal variant or posterolateral corner anomaly?

Unraveling the Posterolateral Corner of the Knee

A symptomatic cyamella in the popliteus tendon causing snapping knee: a case report and literature review

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