American Journal of Neuroradiology 24:177-184, February 2003
© 2003 American Society of Neuroradiology
SPINE
Percutaneous Translumbar Spinal Cord Compression Injury in a Dog Model That Uses Angioplasty Balloons: MR Imaging and Histopathologic Findings
a Department of Radiology (Division of Neuroradiology), The University of Texas, Southwestern Medical Center at Dallas, Dallas, TX
b Department of Neurological Surgery, The University of Texas, Southwestern Medical Center at Dallas, Dallas, TX
c Department of Pathology (Division of Neuropathology), The University of Texas, Southwestern Medical Center at Dallas, Dallas, TX
d Animal Resources Center, The University of Texas, Southwestern Medical Center at Dallas, Dallas, TX
e Mobility Foundation Center, The University of Texas, Southwestern Medical Center at Dallas, Dallas, TX
f Department of Pathology (Immunohistochemistry Laboratories), The University of Texas, Southwestern Medical Center at Dallas, Dallas, TX
Address reprint requests to Phillip D. Purdy, MD, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390
BACKGROUND AND PURPOSE: Previous animal models for spinal cord injury required laminectomy and exposure of the spinal cord to create direct trauma, compromising imaging by both surgical artifact and the nature of the production of the injury. Our purpose was to study a model that uses percutaneous intraspinal navigation with an angioplasty balloon, providing a controlled degree of spinal cord compression and allowing improved MR imaging of spinal cord injury.
METHODS: Nine mongrel dogs were studied. MR images were obtained of six dogs after technique development in three dogs. Angioplasty balloons measuring 7 or 4 mm in diameter and 2 cm in length were placed in the midthoracic subarachnoid space. Imaging was performed by using a 1.5-T MR imaging unit before and after balloon inflation. The balloon was inflated within 5 seconds and deflated after 30 minutes. T1- and T2-weighted and contrast-enhanced images were acquired. Spinal cords were submitted for pathologic examination.
RESULTS: All four animals with 7-mm balloons experienced hemorrhage, and three had axonal injury revealed by histopathologic examination. One of two animals with 4-mm balloons experienced no injury, and one had axonal injury without hemorrhage. Regional parenchymal enhancement was seen in two of the animals with 7-mm balloons.
CONCLUSION: This percutaneous spinal cord injury model results in a graduating degree of injury. It differs from previous techniques by avoiding surgical exposure and the associated artifacts, yet it offers histopathologic findings similar to those of human spinal cord injury. The canine spinal cord is amenable to MR imaging with clinical imaging units. Further evaluations with various durations of compression and various balloon sizes are warranted.
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