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DOI: 10.1055/s-0029-1224773
© Thieme Medical Publishers
Comparative Analysis of Extensions of Transbasal Approaches: Effect on Access to Midline and Paramedian Structures
Publication History
Publication Date:
26 May 2009 (online)
ABSTRACT
We sought to quantitate the effect of extensions of transbasal approaches (TBAs) on midline and paramedian targets of the cranial base. Eight silicone-injected cadaveric heads were dissected with extensions of TBA level I removal of the orbital bar. Objective measures were the comparisons of the accessibility of midline and paramedian targets with progressive dissections by level II detachment of the medial canthal ligaments and removal of the nasal bone and by level III removal of the lateral orbital walls with lateral orbital retraction. Mean areas of freedom increased for most targets with progressive bone removal. For midline targets, the most effective freedom increment was at the pituitary gland (level II: 28.8%, p = 0.05; level III: 107.1%, p < 0.001). For paramedian targets, the best freedom increment was for the foramen rotundum (level II: 56.4%; level III: 134.5%, all p < 0.001). Extensions of the TBA can increase the surgical corridor to midline and paramedian structures, especially for pituitary and maxillary regions. Level II exposure offers no clear benefit for most targets except the foramen rotundum. With level III exposure, all targets are effectively exposed compared with levels I and II.
KEYWORDS
Clivus - cranial base surgery - craniofacial resection - quantitative analysis - transbasal approach
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Mark C PreulM.D.
c/o Neuroscience Publications; Barrow Neurological Institute
350 W. Thomas Road, Phoenix, AZ 85013
Email: mark.preul@chw.edu