Document Detail

Endoscopic pituitary surgery with and without image guidance: an experimental comparison.
MedLine Citation:
PMID:  17368519     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The combination of image guidance and endoscopy is the newest trend in pituitary surgery. To assess the impact of image guidance on EPS, we measured and calculated the accuracy of the system and compared some critical surgical steps with and without image guidance under experimental conditions in terms of surgical time and precision. METHODS: Twenty cadaver heads were explored by standard endoscopic transsphenoidal surgical technique. Optic-radiologic correlations of topographic landmarks were photographed, and the system accuracy and actual visual accuracy were recorded. Some important anatomical parameters were measured in surgical field and on navigation system, and the differences were calculated and analyzed. Some critical surgical steps were recorded and compared between with and without image guidance. RESULTS: The system accuracy (root mean square), calculated by the computer automatically, showed a mean value of 0.28 +/- 0.06 mm. In some cases, there was a small discrepancy between the visible position of the pointer and its counterpart on the navigation system; we coined this actual visual accuracy. The average value was 1.53 +/- 0.49 mm. The maximum difference between the measurements from the navigation system and from their actual visual counterparts was less than 7%. With and without image guidance, in normal anatomical conditioning, there was no statistically significant difference between the duration of ostium sphenoidale exposure and sellar window creation; however, in anatomical variations, the surgical time was shown to be significantly shorter when navigation was used. CONCLUSION: We have demonstrated in this experimental setting that the electromagnetic tracking image guidance possesses a high accuracy at millimetric level and therefore provides precise localization and orientation in EPS. With the assistance of neuronavigation system, it is advantageous not only in saving operating time, but also, more importantly, in enhancing the orientation, thus, rendering surgeries safer and more efficient. During the in vivo pituitary surgery, EPS with image guidance can provide accurate and reliable stereoinformation to achieve better results with lesser risks, particularly in complex cases or in reoperations, even in the hands of experienced surgeons.
Jian Gong; Gérard Mohr; Jean L Vézina
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-03-26
Journal Detail:
Title:  Surgical neurology     Volume:  67     ISSN:  0090-3019     ISO Abbreviation:  Surg Neurol     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-05-21     Completed Date:  2007-06-26     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0367070     Medline TA:  Surg Neurol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  572-8; discussion 578     Citation Subset:  IM    
Division of Neurosurgery, Laboratory of Experimental Neurosurgery, Lady Davis Institute for Medical Research, Sir Mortimer B. Davis-Jewish General Hospital, McGill University, Montreal, Quebec, Canada. <>
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MeSH Terms
Electromagnetic Phenomena / methods
Endoscopy / methods*
Equipment Design
Neurosurgical Procedures / instrumentation*
Pituitary Gland / radiography,  surgery*
Sella Turcica / anatomy & histology,  surgery
Sphenoid Sinus / anatomy & histology,  surgery
Surgery, Computer-Assisted / instrumentation*,  standards
Tomography, X-Ray Computed

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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