PMC4772905_01
DSA by carbon dioxide contrast showed the stenosis of the popliteal artery and smooth proximal and distal reference segments.
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As shown in Figure 1, digital subtraction angiography (DSA) of the left lower extremity showed that the left popliteal artery had a severe eccentric stenosis.
Intravascular ultrasound revealed the nonatherosclerotic lesion and the extrinsic compression of the lumen by the extravascular cyst. The cystic appearance (extravascular hypodensity area) can be visualized clearly.
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IVUS (ViewIT; Terumo Corporation) revealed a nonatherosclerotic lesion and cystic appearance; the area of extravascular hypodensity was clearly visualized, which was causing extrinsic compression of the lumen (Fig. 2).
The axial image: MRI clearly showed cystic lesions encompassing the left popliteal artery circumferentially (A). The sagittal image: these cystic lesions also exhibited high signal intensity on T2-weighted images clearly (B).
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The axial view of MRI revealed cystic lesions encompassing the left popliteal artery circumferentially (Fig. 3A). In the sagittal view of MRI, these cystic lesions also exhibited high signal intensity on T2-weighted images clearly (Fig. 3B).
Hematoxylin-eosin staining showed that the cyst exists in the adventitia and the cyst wall has no endothelial cells.
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Histopathologic analysis of the segment demonstrated myxoid change with formation of cystic spaces, primarily involving the adventitia (Fig. 4).