Simultaneous presence of a popliteal cyst and subgastrocnemius bursitis in a right knee. In this axial three-dimensional Dual Echo at Steady State image there is a communication through the gap between the medial head of gastrocnemius (†) and the semi-membranosus tendon (*). Arrows, popliteal cyst; arrowheads, subgastrocnemius bursitis.