Abstract
Roentgenologic vizualization of the caudal portion of the spinal dural sac offers a means to detect deformities of its contour which may be produced by neoplasms, congenital abnormalities or traumatic lesions. Visualization of the caudal sac has been produced by intrathecal injections of substances opaque to the x-rays, namely, halogen oils. The chief disadvantages in the use of these substances are: First, irritation is produced by a foreign body in the subarchnoid space; second, the absorption of the oil is very slow (it may never be completely absorbed), and third, owing to the viscosity of the oils used false defects often cause confusion in interpretation. The use of halogen oils is not without risk or limitations, and for this reason we propose the intrathecal injection of air or oxygen. Air was first used to visualize the brain and its ventricles and has not to our knowledge been used as herein
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