Intraoperative electron beam irradiation is being used for the therapeutic and prophylactic treatment of the paraaortic nodes in cancer of the uterine cervix. A Varian 18 meV accelerator is employed at an electron energy setting of 6-18 meV. Special aluminum and lucite collimators allow visualization of treatment area and keep the uninvolved small bowel out of the treatment beam. A one-time dose of 2000 rads is delivered in 4 minutes. The procedure presents no special surgical problems, is well tolerated, and appears as a promising supplement in cases where abdominal exploration for surgical staging of cervical carcinoma is carried out.