Leptomeningeal
Having to do with the leptomeninges, the two innermost layers of tissues that cover the brain and spinal cord. Leptomeningeal metastasis refers to cancer that has spread from the original (primary) tumor to the leptomeninges.
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The two innermost layers of tissue that cover the brain and spinal cord. The two layers are called the arachnoid mater and pia mater.
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An area of abnormal tissue change. Lesions vary in severity from harmless to serious.