부가기능
Diagnostics - Identification of Ossification of the Posterior Longitudinal Ligament Extending Through the Dura on Preoperative Computed Tomographic Examinations of the Cervical Spine - The double-layer computed tomographic sign (OPLL along the anterior/posterior margins of the PLL) is pathognomonic for OPLL extending through the dura, whereas the single-layer sign (solid irregular mass of OPLL with a C configuration) is less specific for dural penetrance. The smooth-layer sign indicates an intact dural plane./
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