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Adel Elnashar, Smruti K. Patel, Almaz Kurbanov, Kseniya Zvereva, Jeffrey T. Keller and Andrew W. Grande

performance of a percutaneous stereotactic radiofrequency rhizotomy (PSR) in a safe and efficient manner. This includes a clear understanding of the FO—its various shapes, anatomical variations, adjacent foramina, potential bony obstacles, and importantly, the decreased surface area in the opening of the FO during surgical positioning. Knowledge of the relationship between various anatomical structures (e.g., lateral pterygoid plate [LPP], foramen lacerum, and pterygoalar or pterygospinous ligaments of the FO) in the surgical view and ossification of these structures is

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Jamal M. Taha, John M. Tew Jr. and C. Ralph Buncher

S everal studies have reported the results of percutaneous stereotactic radiofrequency rhizotomy (PSR) in the treatment of trigeminal neuralgia. 1, 9, 10 However, at least two issues need further investigation: first, the long-term outcome in patients after PSR and, second, the timing of pain recurrence. The first issue, long-term results of PSR for the treatment of trigeminal neuralgia, has usually been reported in retrospective studies. 1, 8–11 The results of these studies have an inherent bias because information obtained from patient medical records may

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Andrew G. Shetter, C. Leland Rogers, Francisco Ponce, Jeffrey A. Fiedler, Kris Smith and Burton L. Speiser

: Grume & Stratton, 1988, pp l139–l144. 10. Taha JM , Tew JM Jr , Buncher CR : A prospective 15-year follow up of 154 consecutive patients with trigeminal neuralgia treated by percutaneous stereotactic radiofrequency rhizotomy. J Neurosurg 83 : 989 – 993 , 1995 Taha JM, Tew JM Jr, Buncher CR: A prospective 15-year follow up of 154 consecutive patients with trigeminal neuralgia treated by percutaneous stereotactic radiofrequency rhizotomy. J Neurosurg 83: 989–993, 1995 11. Young RF : Glycerol

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Bruce E. Pollock, Robert L. Foote, Scott L. Stafford, Michael J. Link, Deborah A. Gorman and Paula J. Schomberg

–102, 1993 16. Régis J , Bartolomei F , Metellus P , et al : Radiosurgery for trigeminal neuralgia and epilepsy. Neurosurg Clin North Am 10 : 359 – 377 , 1999 Régis J, Bartolomei F, Metellus P, et al: Radiosurgery for trigeminal neuralgia and epilepsy. Neurosurg Clin North Am 10: 359–377, 1999 17. Taha JM , Tew JM Jr , Buncher CR : A prospective 15-year follow up of 154 consecutive patients with trigeminal neuralgia treated by percutaneous stereotactic radiofrequency rhizotomy. J

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Nelly Amador and Bruce E. Pollock

topography of pain and site of the neurovascular conflict). Prospective study in a series of 579 patients . Acta Neurochir (Wien) 144 : 1 – 13 , 2002 26 Skirving DJ , Dan NG : A 20-year review of percutaneous balloon compression of the trigeminal ganglion . J Neurosurg 94 : 913 – 917 , 2001 27 Taha JM , Tew JM Jr : A prospective 15-year follow-up of 154 consecutive patients with trigeminal neuralgia treated by percutaneous stereotactic radiofrequency rhizotomy . J Neurosurg 83 : 989 – 993 , 1995 28 Theodosopoulos PV , Marco E

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Bruce E. Pollock

99 : 511 – 516 , 2003 24 Taha JM , Tew JM Jr : A prospective 15-year follow-up of 154 consecutive patients with trigeminal neuralgia treated by percutaneous stereotactic radiofrequency rhizotomy . J Neurosurg 83 : 989 – 993 , 1995 25 Tawk RG , Duffy-Fronckowiak M , Scott BE , Alberico RA , Diaz AZ , Podgorsak MB , : Stereotactic Gamma Knife surgery for trigeminal neuralgia: detailed analysis of treatment response . J Neurosurg 102 : 442 – 449 , 2005