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Prone positioning for successful gamma knife radiosurgical treatment of far anterior skull base lesions: a technical note. J Neurol Surg A Cent Eur Neurosurg 2012 Aug;73(4):243-8

Date

07/25/2012

Pubmed ID

22825837

DOI

10.1055/s-0032-1304214

Scopus ID

2-s2.0-84871866121   2 Citations

Abstract

BACKGROUND: Gamma Knife targeting is geometrically limited by the physical dimensions of the head, helmet, headframe, and the radiation target position. All four aspects need to be considered for accurate treatment planning. Within the available space, delivery of the treatment isodose is based on the target position, which must be brought into the center of the collimator. In cases of anatomically challenging target positions in far eccentric locations of the head, careful treatment planning needs to be performed that does not exceed the limits of the system.

CLINICAL PRESENTATION: We describe a case of a challenging far anterior ethmoid sinus hemangiopericytoma in an 80-year-old woman.

TECHNIQUE: The tumor was treated successfully by positioning the patient prone on a Model C Gamma unit. The physical restrictions of the Gamma Knife surgical system and the rationale for improved anterior targeting using the prone position are discussed.

CONCLUSION: A thoughtful approach to positioning in challenging anterior lesions extends the targeting capabilities of certain Gamma units.

Author List

Clarke MJ, Foy AB, Garces YI, Link MJ

Author

Andrew Foy MD Associate Professor in the Neurosurgery department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Aged, 80 and over
Ethmoid Sinus
Female
Hemangiopericytoma
Humans
Magnetic Resonance Imaging
Nasal Cavity
Prone Position
Radiosurgery
Skull Base Neoplasms
Tomography, X-Ray Computed