Myelography is a diagnostic test to determine if there is compression of the spinal cord in the neck of a horse.  A myelogram is performed under general anesthesia.  Cerebrospinal fluid is removed and replaced with a contrast agent, which outlines the spinal cord.  A series of radiographs is taken with the head and neck in a neutral position, flexed and extended.  The contrast agent outlines the spinal cord and makes it easier to detect subtle compressive lesions.

A myelogram is often the most important test in the diagnosis and consideration for surgery for horses with suspected cervical spinal cord compression (wobbler’s disease).