This variety of the disease may be symptomatic of other diseases of the brain, as tubercles, etc. It is sometimes the sequel of the acute form, in which case the symptoms subside in a great degree, but do not entirely disappear. It frequently sets in without any acute form. There is headache, drowsiness, and unequal temper. The intellect is generally clouded, and all the organs of sense more or less affected. There is a peculiar look to the eyes, sometimes squinting, and the pupils sometimes dilated.

After effusion takes place, the intelligence is more or less affected, except in those cases, where the head rapidly enlarges, when for a time the intellect may be even brighter than usual. After a time the child retrogrades until it has the look of an idiot, forgetful, babbling words without meaning, until at last it sinks into indifference, stupor or coma. A striking feature of the disease is the enlargement of the head, which sometimes reaches an enormous size. The face after a time seems to shrink, presenting an old and withered look. The limbs are feeble and the walk uncertain. Very often the child is attacked by general or partial convulsions, followed by paralysis, which may effect nearly all the organs of the body. The pulse gradually becomes weak, the respiration after a time fails, and the appetite at length diminishes.

This disease may be developed during the progress of scarlatina, measles, small-pox, hooping cough, difficult dentition, etc.

Treatment

We can only mention here some of the prominent remedies. Among them we may notice Arsenic, Hellebore, Mercury, Sulphur. For particular indications, see acute Hydrocephalus. The appropriate remedy should be administered two or three times a day.