Fig 11-6 Myelogram showing displacement of subarachnoid space containing radiopaque substance (black). A, intramedullary mass (or midline dorsal or ventral extramedullary, intra- or extradural mass) showing spindle-shaped enlargement of spinal cord. B, extradural mass causing complete block. Substance introduced from lumbar and cisternal punctures to delineate lower and upper extent of block.

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