Hydrocephalus

What is this condition?

Hydrocephalus means abnormal accumulation of cerebrospinal fluid in the brain’s ventricles, causing enlargement and sometimes raised pressure. It may result from blockage, impaired absorption or, rarely, excess production. It affects infants, children and adults differently; normal-pressure hydrocephalus in older adults is a distinct clinical pattern.

What symptoms can it cause?

• Infants: enlarging head, bulging soft spot, vomiting, irritability or downward-looking eyes
• Older children/adults: headache, vomiting, blurred vision, drowsiness or gait difficulty
• Older adults: gait slowing, urinary urgency/incontinence and cognitive decline
• Shunt patients: recurrence of pressure symptoms, fever, redness or abdominal pain

How is it assessed and diagnosed?

CT or MRI confirms ventricular enlargement and may show the cause. The eye examination can reveal raised pressure. In suspected normal-pressure hydrocephalus, gait assessment, cognitive testing and a large-volume lumbar tap or drainage trial may help predict response. Imaging must be distinguished from age-related ventricular enlargement.

Treatment without surgery

A temporary external drain may be used in acute illness. Treating infection, bleeding or the causative mass can sometimes improve flow. Medicines do not provide durable correction for most structural hydrocephalus, although they may be used briefly in selected situations.

When is surgery or a procedure considered?

Surgery is required when hydrocephalus causes pressure, neurological decline or a credible symptomatic normal-pressure pattern. A ventriculoperitoneal shunt diverts fluid to the abdomen. Endoscopic third ventriculostomy creates an internal bypass in selected obstructive cases, sometimes combined with treatment of a cyst or tumour.

Treatment and procedure options

• Ventriculoperitoneal or another CSF shunt
• Endoscopic third ventriculostomy for selected obstruction
• External ventricular drainage for emergency control
• Treatment of the underlying tumour, cyst, bleed or infection

Risks from the disease and from treatment

Untreated raised pressure can damage vision, brain development, consciousness and life. Shunts can block, infect, over-drain or disconnect and may need revision. Endoscopic openings can also close, so recurrence of symptoms is always taken seriously. No procedure is risk-free. General risks include anaesthetic problems, bleeding, infection, blood clots and delayed healing. Neurological risks depend strongly on the exact structure being treated and may include new weakness, numbness, speech or vision change, seizure, cerebrospinal-fluid leakage, need for another procedure or failure to obtain the hoped-for relief. The surgeon should discuss the risks that apply to the individual case.

Recovery and follow-up

Improvement depends on cause and duration. Headache and pressure may improve quickly; gait can improve over weeks, while long-standing cognitive or nerve damage may remain. Families need a written shunt warning plan and lifelong awareness of malfunction symptoms. Recovery is not judged only by the first few days. Pain control, wound care, nutrition, safe mobilisation, physiotherapy and planned follow-up all matter. Some symptoms improve quickly after pressure is relieved; others recover gradually over weeks or months, and permanent nerve injury may not fully reverse.

Preparing for your consultation

Bring the original MRI/CT images or digital files, written reports, previous prescriptions, a current medicine list, and any operative or pathology records. For sudden warning symptoms, use the nearest emergency department rather than waiting for a routine appointment.

Authoritative patient-information sources

• NINDS — Hydrocephalus: https://www.ninds.nih.gov/health-information/disorders/hydrocephalus