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Balloons can be used for vascular occlusion in both a temporary (nondetachable) and a permanent (detachable) fashion. Temporary occlusion or partial occlusion with a nondetachable balloon may be beneficial when delivering particulate embolic agents (Greenfield et al. 1978). The balloon can be used to decrease the rate of blood flow to prevent unwanted occlusion at a distal site (Greenfield et al. 1978). The use of detachable balloons as a permanent vascular occlusion device has fallen out of favor, as newer permanent vascular occlusion agents have developed (Lustberg and Pollak 2006).