Percutaneous needle biopsy under fluoroscopic, sonographic, or CT control is a widely applied diagnostic test. Generally, needles 18-gauge or smaller produce satisfactory samples for cytologic or histologic analysis. In some instances (e.g., classification of a lymphoma), it may be desirable to obtain a larger specimen, thus necessitating the use of a larger needle. For some liver and retroperitoneal biopsies for which an access route free of bowel or known vascular structures is available, a 1 4-gauge Tru-Cut needle (Travenol Laboratories, Deerfield, IL) is often used. In these circumstances, the major complication is bleeding. Two recent reports [1 , 2] describe embolization of such biopsy tracts to control bleeding. Chuang and Alspaugh [1] used a vascular sheath in combination with the Tru-Cut needle. After the needle was removed from the sheath, the tract was occluded with absorbable gelatin sponge particles (Gelfoam, Upjohn, Kalamazoo, Ml) as the sheath was withdrawn under fluoroscopic control. Allison and Adam [2] used a needle with a Tru-Cut “action,” which came equipped with an 8-French sleeve. They occluded the tract by using a specially designed needle to deliver a hemostasis coil. We have devised a simpler and more cost-effective technique for tract embolization. This method eliminates the need to anticipate bleeding and to use special equipment routinely, thereby needlessly incurring additional expense.