Several pelvic malignancies in late stage have involvement of the inguinal nodes requiring radiation therapy. In recent years, our treatment plan has been changed to an opposed pelvic portal with the inguinal nodes treated in the anterior portal only by use of an anterior transmission block. This treatment technique was designed to avoid the problem of matching two radiation therapy portals. The advantages of this technique include easy treatment planning, adequate everyday set-up of the treatment portals, and no overlap by using separate pelvic fields and inguinal fields, reducing the complication rate.