Disorders of the spinal cord and related structures - ClinicalKey

Spine tumors are localized according to the anatomic compartment in which they occur: extradural , intradural-extramedullary , or intramedullary ( Figs. 61.1 and 61.2 ). Certain tumors may invade multiple anatomic planes. Extradural tumors may be primary spinal tumors (benign or malignant) or secondary tumors (due to metastatic disease). Intradural-extramedullary tumors arise within the dura but outside the spinal cord. These tumors displace the spinal cord toward the contralateral side of the thecal sac. The most common tumors arise from the sheath cells covering the spinal nerve root (schwannoma, neurofibroma) or from the arachnoid cap cells in the dura (meningioma). If the tumor arises as the nerve root leaves the dural sac, it may possess both an intradural and extradural component (dumbbell-shaped tumor). Intramedullary tumors originate from the parenchyma of the spinal cord. The characteristic pattern on magnetic resonance imaging (MRI) is widening of the spinal cord and narrowin

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• Ahash Ganeshamoorthy