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Neck flexion has been shown to increase cranial spread of contrast agent when a small fixed volume was injected into the high thoracic epidural space. The purpose of this study was to evaluate the effect of volume of contrast medium on its distribution through the high thoracic epidural space during neck extension and flexion using the rabbit model.

Spreading pattern of contrast medium in the high thoracic epidural space in rabbits: the effect of neck flexion and extension