Internal Hydrocephalus

It is by no means rare to find occlusion of the aqueduct of Sylvius as one of the etiologic factors in internal hydrocephalus mentioned in text-books dealing with this subject. Attention is particularly attracted by the fact, however, that no references are given in most of the articles which refer to this occlusion as a possible cause, whereby one can determine that the author is speaking from clinical experience and not theorizing. We have been struck with thea posteriorinature of discussions on this subject, and it is therefore with pleasure that we bring forward a case of internal hydrocephalus the cause of which is probably congenital almost total occlusion of the aqueduct of Sylvius. Anton,1in dealing with the causes of hydrocephalus, quotes Baginsky's opinion that acute hydrocephalus is identical with acute non-tuberculous inflammation of the choroid plexus and the following increase of exudation. He adds that