The significance of non-filling of the ventricular system at pneumoencephalography.
D000388:Air; D014695:Cerebral Ventriculography; D002946:Cisterna Magna / Q000000981:diagnostic imaging; D006801:Humans; D008722:Methods; D011011:Pneumoencephalography; D013129:Spinal Puncture; D013346:Subarachnoid Space / Q000000981:diagnostic imaging