SUBDURAL INJECTION OF CONTRAST-MEDIUM DURING CERVICAL MYELOGRAPHY

Three patients (1 dog, 2 horses) are described where myelography was c omplicated, purportedly by injection of contrast medium into the menin ges superficial to the subarachnoid space, Contrast medium injected in this location in a cadaver tended to accumulate dorsally within the v ertebral canal, deep to the dura mater but superficial to the subarach noid space, The ventral margin of the pooled contrast medium had a wav y or undulating margin and the dorsal margin was smooth, pooled contra st medium was believed to be sequestered within the structurally weak dural border cell layer between the dura mater and arachnoid membrane, or the so-called subdural space.