Popliteal cysts and aneurysm on ultrasound imaging

A Doppler US of the popliteal fossa shows an anechoic popliteal cyst (arrow). Image B shows a septation in a popliteal cyst (arrow). Image C shows echogenic material (arrows) within a popliteal cyst. Image D is a popliteal aneurysm compressing the popliteal vein (arrowhead). The lumen of the aneurysm (asterisk) is surrounded by thrombus (arrow) within the aneurysm.