A case of cystic degeneration of the transverse ligament located posteriorly to the dens and causing compression to the lower medulla and upper cervical spinal cord is reported. The clinical, pathological, and radiological findings are described and compared to the literature to characterize this syndrome more fully. The advantages of a posterolateral surgical approach are stressed.
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| http://dx.doi.org/10.3171/jns.1997.86.6.1027 | DOI Listing |
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A transversely isotropic diode-pumped solid-state laser is used to obtain an orthogonally dual-polarization nonplanar circular mode (NCM) under off-axis pumping in the strictly degenerate cavity. Each polarized component of the NCM outside the cavity is revealed to be individually localized on the ray orbits forming a nonplanar surface, in which the transverse patterns display multiple spots well positioned on a circular structure. An analytical representation is established to explore polarization-resolved components of the NCM by utilizing the Gaussian wave packet to directly correlate with geometrical rays.
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