Fig. 1

Intensity-modulated radiation plan for pre-operative chemoradiation treatment for locally advanced rectal cancer. Axial image at the level of the proximal thigh. Inguinal nodes were treated based on the low-lying location of the rectal lesion. Radiation dose prescription = 5000 cGy. Isodose lines, red: 95 %, purple: 80 %, beige: 50 %