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Coils are the most commonly used mechanical embolization device. Most coils are constructed from stainless steel, platinum, or nitinol; threads are often attached to increase thrombogenic potential (Lustberg and Pollak 2006; Valji 2006; Ginat et al. 2009). Coils can be made in a variety of shapes and sizes and are often delivered from a 5 French angiography catheter or 3 French microcatheter (Wojtowycz 1990b; Lustberg and Pollak 2006). A coil should be properly sized to the vessel that is being embolized. A coil that is too large may not fully “coil” and as a result protrude into a feeding vessel (Wojtowycz 1990b). A coil that is too small can migrate distally or proximally, leading to embolization of the wrong vessel (Valji 2006). Coils are generally used in the embolization of nononcologic diseases such as arteriovenous fistulas and traumatic bleeds; however, reports of coils for the preoperative embolization or definitive treatment of renal, biliary, and hepatic neoplasia exist (Madoff et al. 2003; Munro et al. 2003; Schwartz et al. 2006; Maxwell et al. 2007). Indications for renal embolization may include preoperative infarction, treatment of metastatic renal neoplasia, nonresectable renal neoplasia, and patients who elect not to undergo radical excision (Munro et al. 2003; Schwartz et al. 2006; Maxwell et al. 2007).