Substantial relief of discomfort may be anticipated by most patients suffering from pelvic and lower-extremity pain who are treated by arterial infusion of nitrogen mustard. Seventy-three patients with intractable pain secondary to malignancy arising in the pelvis received 83 percutaneous pelvic arterial infusions of this drug. Sixty infusions (72%) resulted in marked relief from pain for periods averaging 6-8 weeks. Advantages of the procedure are low toxicity, relative simplicity and availability of technique, and an acceptable rate of complications with minimal morbidity. Patients...