120 Korean J Pain Vol. 25, No. 2, 2012 abscess formation in suboptimally controlled diabetes mellitus. Case Report Med 2011; 2011: 249325. 8. Wada Y, Yanagihara C, Nishimura Y. Bilateral iliopsoas hema- tomas complicating anticoagulant therapy. Intern Med 2005; 44: 641-3. 9. Yang WT, Yeo W, Metreweli C. Imaging of iliopsoas meta- stasis. Clin Radiol 1999; 54: 85-9. 10. Avery GR. Metastatic adenocarcinoma masquerading as a psoas abscess. Clin Radiol 1988; 39: 319-20. 11. Hood RS. Far lateral lumbar disc herniations. Neurosurg Clin N Am 1993; 4: 117-24. 12. Dangaria TR, Naesh O. Changes in cross-sectional area of psoas major muscle in unilateral sciatica caused by disc herniation. Spine (Phila Pa 1976) 1998; 23: 928-31. 13. Trummer M, Flaschka G, Unger F, Eustacchio S. Lumbar disc herniation mimicking meralgia paresthetica: case report. Surg Neurol 2000; 54: 80-1. 14. Sajko S, Stuber K. Psoas Major: a case report and review of its anatomy, biomechanics, and clinical implications. J Can Chiropr Assoc 2009; 53: 311-8. 15. Torres GM, Cernigliaro JG, Abbitt PL, Mergo PJ, Hellein VF, Fernandez S, et al. Iliopsoas compartment: normal anatomy and pathologic processes. Radiographics 1995; 15: 1285-97. 16. Mannion S. Psoas compartment block. Contin Educ Anaesth Crit Care Pain 2007; 7: 162-6. 17. Manchikanti L. Role of neuraxial steroids in interventional pain management. Pain Physician 2002; 5: 182-99. www.epain.org