VMAT plan showing different dose curves covering the GTV (red arrow), CTV (green arrow), and PTV (blue arrow), while avoiding high dose in the OARs. Note the location of SMA (black hollow arrow).VMAT, volumetric modulated arc therapy; GTV, gross tumor volume; CTV, clinical target volume; PTV, planning target volume; OARs, organs at risk; SMA, superior mesentery artery