’ Myelogram lesions1. Flow and distribution of contrast medium is dependent on gravity (i.c., patient positioning) and viscosity of contrast agent.2. Poor or absent filling and opacification of subarachnoid • space may be due to obstruction to flow or lack of gravity-dependent movement.3. Make every effort to opacify subarachnoid space cranial and caudal to a suspected lesion:a. Raise or lower cranial or caudal end of animal.b. Make a second injection at other end (lumbar or cervi¬cal site).4. Obstruction to flow may be caused by altered position, size, or shape of spinal cord or space occupying mass in subarachnoid space.-5. Lesions commonly cause narrowing of contrast columns:a. Greater than 50% narrowing is significant; less than 50% is equivocal.6. Extradural lesion (Figures 3.9 and 3.10):a. Located outside of dura mater.b. Lesion causes compression of spinal cord and sub arachnoid space.
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