Epidural masses were produced in 18 monkeys with percutaneously introduced balloon catheters. Masses in front of the cord displace the cord posteriorly and obstruct the subjacent central perforating arteries. The anterior spinal artery, however, is not obstructed unless the anterior mass is very large. Lateral epidural masses displace the cord without obstructing either anterior spinal or central perforating arteries.
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Ramsey et al. (1973) studied this question.
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