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Rhabdomyolysis is a rare but potentially lethal clinical syndrome that results from acute muscle fiber necrosis with leakage of muscle constituents into blood. This devastating disease could be due to muscle compression caused by urologic positioning for a lengthy nephrectomy. In this regard, laparoscopic renal surgery may be a risk for the development of rhabdomyolysis. This phenomenon of massive muscle necrosis can produce secondary acute renal failure. The risk factors have to be managed carefully during anesthetic management. Here, we report a case of a patient with rhabdomyolysis that developed in the flexed lateral decubitus position during laparoscopic nephrectomy. (Korean J Anesthesiol 2010; 59: S41-S44