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Figure 1a: Images of a 17-year-old woman with an osteosarcoma of the distal femur. The femoral artery was classified as free at surgery. (a) Transverse short inversion time inversion-recovery MR image (3100/15/150) shows a fat plane and muscle between the femoral artery (long arrow) and the tumor (short arrows). (b) Contrast-enhanced coronal MR angiographic image (6.3/1.5/27.0) shows a normal femoral artery (arrows) without stenosis. Note the slight bowing of the artery, which is probably caused by the tumor. On this image, there is a partial superimposition between the femoral artery and the femoral vein.