Fig. 3

Adventitial cystic disease of the popliteal artery in a 50-year-old woman with intermittent claudication of the right lower extremity. (a) Axial CT angiography shows a well-circumscribed fluid-density lesion within the popliteal fossa (asterisk) compressing the popliteal artery. (b) Sagittal maximum-intensity projection reconstruction of CT angiography shows eccentric stenosis of the popliteal artery (scimitar appearance), with significant narrowing of the vessel lumen (solid arrows). Note the collateralization (curved arrow) with dilation of the sural artery (dashed arrow). (c, d) Sagittal and axial fat-suppressed T2-weighted MR images show hyperintense signal of the arterial wall mass (arrows) confirming its cystic nature. (e) Axial T1-weighted MR image shows hyperintense signal of the cystic mass (arrow) related to mucinous content. (f) Intraoperative photo showing cystic lesion arising from the popliteal artery wall (arrows). (g) Photograph of the resected specimen after longitudinal transection, showing cystic lesion developing within the lumen of the popliteal artery (arrow)