Hydrocephalus, congenital
Hydrocephalus present at birth.
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- 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 […]
- Hydronephrosis
Distention of the kidney with urine. Hydronephrosis is caused by obstruction of urine outflow (for example, by a stone blocking the ureter).