Hydrocephalus, communicating
Hydrocephalus in which there is no obstruction to the flow of the cerebrospinal fluid (CSF). Specifically, there is no obstruction within the ventricular system of the brain or where the CSF passes into the spinal canal. Communicating hydrocephalus is due to overproduction of CSF or failure of the brain to reabsorb CSF normally.
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- Hydrocephalus, congenital
Hydrocephalus present at birth.
- Hydrocephalus, Macewen sign of
A sign to detect hydrocephalus (and brain abscess). Percussion (tapping) on the skull at a particular spot (near the junction of the frontal, temporal and parietal bones) yields an unusually resonant sound in the presence of hydrocephalus or a brain abscess. Named for Sir William Macewen (1848-1924), a surgeon in Glascow, Scotland who also described […]
- Hydrocephalus, normal pressure
Normal pressure hydrocephalus.
- Hydrocephaly
In infants the most obvious sign of hydrocephalus is usually an abnormally large head. (That is one reason a baby’s head should be measured at every well-baby visit). Symptoms of hydrocephalus in an infant may include vomiting, sleepiness, irritability, an inability to look upwards, and seizures. In older children and adults there is no head […]
- Hydrogen
The most plentiful element in the universe and one present in all organic compounds. Hydrogen is a gas with an atomic number of 1 and the symbol H. Two isotopes of hydrogen — deuterium and tritium — have been used as tracers in metabolic studies. Tritium is a long-lived weak emitter of radiation and can […]