Figure 12a. Axillobifemoral bypass stenosis. (a, b) Axial CT images depict a subcutaneous axillobifemoral bypass (arrow in a) and a fluid collection from infection (arrow in b) surrounding and compressing the extraanatomic graft. (c, d) Lateral volume-rendered images of the axillobifemoral bypass show several mild stenoses and one severe stenosis (arrow) due to the periprosthetic fluid collection. Note the absence of enhancement in the infrarenal aorta in d, a result of thrombosis.