Signs and Symptoms of Hydrocephalus in Children
The clinical presentation of hydrocephalus in children varies dramatically by age, with infants primarily showing macrocephaly (rapidly enlarging head circumference >2 cm in <7 days), bulging fontanelle, and splayed cranial sutures, while older children present with symptoms of raised intracranial pressure including headache, vomiting, lethargy, and behavioral changes 1, 2.
Age-Specific Presentations
Infants (Birth to 24 months)
Physical Signs (Most Reliable):
- Progressive head enlargement - the cardinal sign, present in virtually all cases 3
- Bulging, tense anterior fontanelle - reliable when assessed by experienced practitioners 1
- Progressive splaying of sagittal suture width - perhaps the most reliable indication of increased intracranial pressure 1
- Distended scalp veins 2
- Setting-sun sign (downward deviation of eyes) - present in 53.85% of cases 3
Clinical Symptoms:
- Apnea and bradycardia episodes 1
- Lethargy and decreased activity 1
- Feeding intolerance 1
- Irritability 4
Critical Caveat: Approximately 50% of infantile hydrocephalus cases may be without symptoms initially, and 25% of cases with documented raised intraventricular pressure may be without obvious signs 2. This underscores why routine head circumference measurements during the first 10 months of life are essential - they detect 72% of hydrocephalus cases, particularly during months 0-10 5.
Older Children (>2 years with closed fontanelles)
Symptoms of Raised Intracranial Pressure:
- Headache - often progressive, worse in morning 2, 4
- Vomiting - the most common symptom in this age group 6, 2
- Behavioral changes 2
- Drowsiness and lethargy 2, 4
- Poor concentration 7
- Dizziness 7
- Disturbances of gait 7
Physical Signs:
- Papilledema (if chronic)
- Neurological deficits depending on etiology 6
- Signs of chronic elevated intracranial pressure on skull X-ray 7
Important Clinical Patterns
Preterm Infants with Posthemorrhagic Hydrocephalus
The presentation follows three distinct patterns 1:
- Catastrophic deterioration (minutes to hours) - grave prognosis, rarely amenable to intervention
- Saltatory course (hours to days, stuttering pattern):
- Decreased alertness and activity
- Hypotonia with abnormally tight popliteal angle
- Abnormal eye movements
- Respiratory difficulties
- Clinically silent - detected only by surveillance ultrasonography; unexplained hematocrit decline may be the only clue
Unusual Presentations
The literature documents 33 different clinical signs of hydrocephalus, including atypical presentations such as macular rash and sweating 2. This remarkable variability means that absence of classic signs does not exclude hydrocephalus, particularly in cases with documented raised intraventricular pressure.
Diagnostic Approach
For Infants:
- Serial head circumference measurements plotted on growth charts (crossing percentiles is concerning)
- Palpation of fontanelle tension and suture width by experienced practitioners
- Low threshold for cranial ultrasonography if any concerning signs
For Older Children:
- High index of suspicion with progressive headache, vomiting, or behavioral changes during puberty 7
- Skull X-ray showing signs of chronic elevated intracranial pressure warrants immediate further investigation 7
- Direct measurement of intracranial pressure may be justified given the variable and sometimes absent clinical presentation 2
Key Clinical Pitfalls
Reliability of physical signs varies significantly between practitioners of different skill levels 1. Serial examinations by the same experienced clinician are most valuable.
Nonspecific symptoms (apnea, bradycardia, lethargy) require frequent communication with neonatology teams to distinguish hydrocephalus from other neonatal conditions 1.
Increased head circumference detection is most effective during the first 10 months of life; after fontanelle closure, other symptoms predominate 5.
The presentation can be sufficiently variable, unusual, or even absent to justify direct intracranial pressure measurement when clinical suspicion exists 2.