Popliteal cysts. The axial (a) and sagittal (b) fat saturated proton density weighted images show a large multiseptated popliteal cyst (asterisks) emerging between the medial gastrocnemius tendon (black arrow) and the semimembranosus tendon (white arrow) and abutting the medial gastrocnemial muscle belly (GN). The axial (c) fat saturated proton density weighted image shows a ruptured popliteal cyst (arrowheads). The axial (d) fat saturated proton density weighted image demonstrates a Baker's cyst (white arrow) with a single loose osteocartilaginous body inside the cyst (black arrow)
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