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The conditions that lead up to internal hydrocephalus are classified by Parkes Weber[13] in the following manner:—

1. ‘Cases secondary to and part of the phenomena of tuberculous or any suppurative meningitis, comparable to pleural effusions due to tuberculous or any septic invasions of the pleura.

2. Cases resulting from the presence of tumours, &c., analogous to the pleuritic effusions accompanying tumours, &c., situated close to or involving the pleura.

3. Ordinary infantile or congenital hydrocephalus, which is, in some cases at least, due to intra-uterine meningitis.

4. Internal hydrocephalus supervening on the epidemic or sporadic type of posterior basic non-suppurative meningitis.

6. Simple idiopathic internal hydrocephalus of adults or older children due to serous ependymitis or ventricular meningitis.

7. Traumatic cases.’

This classification possibly includes all the various grades and degrees of internal hydrocephalus, but for all practical purposes the cases may be grouped into two classes, congenital and acquired, both of which may be either acute or chronic.