Clinical features of hydrocephalus
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Clinical Features of Hydrocephalus
Hydrocephalus is a pressure-dependent enlargement of the cerebral ventricles due to obstruction of, or impaired resorption of, CSF. Clinical features vary significantly by age of onset and whether the presentation is acute or chronic.
1. Classification Relevant to Clinical Features
| Type | Mechanism | Key Feature |
|---|---|---|
| Noncommunicating (obstructive) | Intraventricular obstruction | Rapid, life-threatening rise in ICP |
| Communicating | Extraventricular obstruction or impaired absorption | May be insidious; includes NPH |
| Normal-pressure hydrocephalus (NPH) | Chronic communicating | Classic triad (see below) |
2. Infants (Before Suture Closure, < 2 years)
Since the skull sutures are still open, the calvarium can expand, so signs of raised ICP are initially masked. Features include:
- Macrocephaly - head circumference crossing centiles on growth charts; the most reliable sign
- Frontal bossing
- Bulging, tense anterior fontanelle - present even when the child is upright and relaxed
- Sutural diastasis (separation of skull sutures)
- Engorged, dilated scalp veins
- Calvarial thinning
- "Sunset" sign (Setting sun sign) - downward deviation of the eyes due to pressure on the tectal plate; indicates failure of upward gaze
- Lateral rectus (VI nerve) palsies - due to raised ICP causing false localizing sign
- Leg spasticity - from stretching of corticospinal tracts as they descend around the enlarged ventricles
- Irritability, poor feeding, lethargy - common nonspecific neonatal symptoms
- "Cracked-pot" (Macewen's) sign - resonant note on skull percussion due to separation of sutures
- Nausea and vomiting - with acute ventricular enlargement
- Optic atrophy - if diagnosis is delayed
Bradley & Daroff's Neurology, p.1854-1855; Grainger & Allison's Diagnostic Radiology, p.2027
3. Older Children (After Suture Closure, > 2-3 years)
Once sutures fuse, head expansion is no longer possible; the presentation shifts entirely to signs of raised ICP:
- Early morning headache - a hallmark; worsened by lying flat (increased ICP with recumbency)
- Nausea and vomiting - often projective, worse in the morning
- Papilloedema on fundoscopy
- Diplopia - commonly from a false localizing VI nerve palsy
- Visual blurring / visual loss - from optic nerve compression
- Ataxia / wide-based gait - from stretching of frontal lobe corticospinal fibers around ventricles, or from direct cerebellar/posterior fossa pathology
- Leg spasticity and hyperreflexia
- Altered conscious level - drowsiness, confusion progressing to coma in severe cases
- Cranial nerve palsies
Posterior fossa tumors (most common cause in older children) cause acute obstructive hydrocephalus, and headaches + vomiting + diplopia + ataxia are the dominant presenting cluster.
Bradley & Daroff's Neurology, p.1855; Grainger & Allison's Diagnostic Radiology, p.2028
4. Adults - Acute Hydrocephalus
Acute obstruction (e.g., cerebellar hemorrhage/infarct compressing the aqueduct, colloid cyst of the third ventricle, subarachnoid hemorrhage) produces:
- Severe headache - sudden onset
- Papilloedema
- Diplopia (VI nerve palsy)
- Mental status changes - confusion, drowsiness, stupor, coma
- Nausea and vomiting
- Ataxia - especially with posterior fossa lesions
- Sudden loss of consciousness - colloid cysts may cause episodic collapse ("ball-valve" effect)
- Sudden death - with extreme acute ICP elevation
- Akinetic mutism - rare; due to pressure on structures around the third ventricle
Bradley & Daroff's Neurology, p.1855
5. Adults - Normal-Pressure Hydrocephalus (NPH)
NPH is a chronic communicating hydrocephalus characterized by the classic Hakim-Adams triad, with symptoms typically appearing in this order:
The Triad (mnemonic: "Wet, Wobbly, Wacky")
| Feature | Description |
|---|---|
| Gait disturbance (Wobbly) | Magnetic or apraxic gait - short shuffling steps, wide base, difficulty initiating movement ("feet stuck to the floor"); appears first |
| Urinary incontinence (Wet) | Urgency incontinence; appears second |
| Dementia/cognitive impairment (Wacky) | Subcortical pattern - psychomotor slowing, memory loss, inattention; appears last |
- CSF pressure measured at lumbar puncture is normal at the time of diagnosis (though elevated pressure likely occurred earlier during the period of ventricular enlargement)
- Symptoms are insidious and progressive
- NPH may be idiopathic or secondary (post-subarachnoid hemorrhage, meningitis, trauma)
- Gait improvement after a large-volume CSF tap (30-50 mL) is a diagnostic and predictive test for shunt response
Bradley & Daroff's Neurology, p.1855-1856
6. Other Notable Features Across Age Groups
- Endocrine dysfunction - short stature, menstrual irregularities, diabetes insipidus, obesity, amenorrhea, polydipsia/polyuria - when the third ventricle is enlarged and compresses the hypothalamo-pituitary axis
- Temporal lobe seizures
- CSF rhinorrhea - when pressure erodes the base of the skull
- Transependymal (periventricular) edema - a radiological correlate of acute active hydrocephalus
7. Summary Table by Age
| Age Group | Hallmark Features |
|---|---|
| Neonate/Infant | Macrocephaly, bulging fontanelle, sunset sign, scalp vein dilation, Macewen sign |
| Older child | Morning headache, vomiting, papilloedema, ataxia, diplopia |
| Adult (acute) | Severe headache, papilloedema, altered consciousness, sudden death risk |
| Adult (NPH) | Triad: gait apraxia → incontinence → dementia; normal CSF pressure |
Sources:
- Bradley & Daroff's Neurology in Clinical Practice, pp. 1854-1856
- Grainger & Allison's Diagnostic Radiology, pp. 2027-2029
- Bailey & Love's Short Practice of Surgery, 28th ed., p. 725
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