Hydrocephalus

[Sarah]

An accumulation of liquid within the cavity of the cranium,especially within the ventricles of the brain; dropsy of the brain.It is due usually to tubercular meningitis. When it occurs ininfancy, it often enlarges the head enormously.

[Sarah]

It's a condition where there is a fluid build up in the brain. This causes the skull to expand in infants where it is not fixed. A shunt is usually inserted into the brain so the fluid can drain.

[Sarah]

A disability that causes water to surround the brain

[Lizzy Liz]

Hydrocephalus is an accumulation of extra fluid in the normal spaces within the brain (ventricles) and/or between the inner and middle layers of tissues that cover the brain (the subarachnoid space). The extra fluid usually causes an enlarged head and developmental problems.

Hydrocephalus occurs when the fluid in the normal spaces in the brain (ventricles) cannot drain.
The fluid may accumulate for many reasons, such as a birth defect, bleeding within the brain, or brain tumors.
Typical symptoms include an abnormally large head and abnormal development.
The diagnosis is based on computed tomography (CT), ultrasonography, or magnetic resonance imaging (MRI).
Surgery is needed to insert a drain (shunt) into the brain or to create an opening that allows fluid to drain.

(See also Overview of Brain and Spinal Cord Birth Defects.)
The fluid surrounding the brain (cerebrospinal fluid) is produced in spaces within the brain called ventricles. The fluid is constantly being produced and must drain to a different area, where it is absorbed into the blood. When the fluid cannot drain, it accumulates in the ventricles and/or subarachnoid space, causing hydrocephalus (water on the brain). Often, the pressure in the ventricles and within the brain increases, compressing brain tissue.
Many conditions, such as a birth defect, bleeding within the brain (often associated with prematurity), or brain tumors, can block drainage and cause hydrocephalus. Hydrocephalus may also be caused by certain gene defects.
Infants can be born with hydrocephalus or it can occur during or after birth.

[Little_Girl]

A condition in which fluid accumulates in the brain, typically in young children, enlarging the head and sometimes causing brain damage.

[Tariq Zaki]

an abnormal increase in the amount of fluid in the skull that results in an increase in pressure inside the skull and an increase in the size of the head: