Popliteal cyst. (A) radiograph demonstrates coarse calcifications (arrow) in the popliteal fossa. (B) USG image at the level of popliteal fossa demonstrates a cystic lesion containing echogenic calcifications (arrow) with posterior acoustic shadowing. (C) Axial T2W image through right knee demonstrates the hyperintense popliteal cyst fluid arising between semimembranosus (arrowhead) tendon and medial head of gastrocnemius (asterisk), with hypointense loose bodies (arrow) layering dependently