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A Painful Knee

A 55-year-old female presented to the family medicine clinic with a complaint of feeling of a mass like sensation behind the knee. There was no history of trauma. There was no other significant medical history. A POCUS examination was performed. The following images were obtained in the popliteal fossa region. What is the most likely […]

A 55-year-old female presented to the family medicine clinic with a complaint of feeling of a mass like sensation behind the knee. There was no history of trauma. There was no other significant medical history. A POCUS examination was performed. The following images were obtained in the popliteal fossa region.

What is the most likely diagnosis?

A. Hematoma
B. Popliteal aneurysm
C. Baker’s Cyst


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Answer:

A large anechoic cystic lesion is seen in the popliteal region. The fluid filled/anechoic neck is seen extending between the medial head of the gastrocnemius and the tendon of the semimembranosus. No internal debris seen within the fluid. Perform color Doppler exam to rule out a vascular lesion.

References

https://emedicine.medscape.com/article/387399-overview

https://radiopaedia.org/articles/baker-cyst-2?lang=us

https://www.ajronline.org/doi/pdfplus/10.2214/ajr.176.2.1760373


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