’ 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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