Planographic Studies of the Fourth Ventricle

In a recent survey and study by Twining2 of the problem of visualization of the third and fourth ventricles, the conclusion was reached that, despite the numerous and complicated technics devised, the problem of adequate demonstration of the fourth ventricle by pneumography is unsolved. The present communication is a preliminary report on the use of planography for demonstrating the fourth ventricle. A more detailed study concerning the use of bodysection roentgenography in the visualization of the fourth ventricle and adjacent structures is in preparation at the present time.