Fig. 1

The white boxes indicate lymph nodes, and the white arrows indicate vessels. (a, c, e and g), coronal high-resolution 2D-TSE-T2WI; (b, d, f and h), coronal fat-suppressed gadolinium-enhanced isotropic high-resolution 3D-GRE-T1WI. a-b, Benign node 3.0 mm in diameter with a smooth border, homogeneous signal, and obvious and homogeneous enhancement. c-d, Benign node 3.6 mm in diameter with a smooth border, mild-heterogeneous signal, and obvious and mild-heterogeneous enhancement. e-f, Node 4.2 mm in diameter adjacent to the rectal wall that was malignant with an irregular border, mild-heterogeneous signal, and intermediate and rim-like enhancement. The superior node 6.2 mm in diameter was also malignant, with a smooth border, obvious-heterogeneous signal, and mild and rim-like enhancement. g-h, Malignant node 8.2 mm in diameter with an irregular border, mild-heterogeneous signal, and mild and obvious-heterogeneous enhancement