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
Explanation
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 is seen within the fluid. Perform a 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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