What is your impression of the adult patient with symptomatic hydrocephalus presenting with headache, ventricular enlargement on CT, and an acellular cerebrospinal fluid sample?

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Last updated: September 23, 2026 • View editorial policy

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Symptomatic Hydrocephalus with Ventricular Enlargement and Acellular CSF

This clinical presentation is most consistent with normal pressure hydrocephalus (NPH), and the patient should undergo CSF diversion evaluation including a lumbar drain trial or high-volume lumbar puncture to assess for symptomatic improvement, followed by ventriculoperitoneal shunt placement if positive response is demonstrated 1.

Clinical Reasoning

The combination of symptomatic hydrocephalus, ventricular enlargement on CT, and acellular CSF in an adult patient strongly suggests NPH rather than infectious or hemorrhagic etiologies. The acellular CSF is critical—it excludes meningitis, subarachnoid hemorrhage, or other inflammatory processes that would show cellular elements 2.

Key Diagnostic Considerations

Primary differential diagnosis:

  • Normal pressure hydrocephalus - Most likely given the presentation
  • Secondary hydrocephalus from prior hemorrhage, tumor, or trauma (requires detailed history)
  • Idiopathic NPH if no clear precipitating cause identified

The headache component warrants careful attention. While NPH classically presents with the triad of gait disturbance, cognitive decline, and urinary incontinence 3, 1, atypical presentations including headache can occur. However, you must actively exclude spontaneous intracranial hypotension (SIH), which presents with orthostatic headache and can paradoxically show ventricular changes 4, 5.

Critical Distinction: NPH vs SIH

Ask specifically about headache characteristics:

  • Orthostatic pattern (worse upright, better lying down) → Consider SIH, requires brain MRI with contrast and spine MRI 4, 5
  • Non-positional headache with gait/cognitive symptoms → Proceed with NPH workup 1

This distinction is crucial because the treatments are opposite: NPH requires CSF removal via shunting, while SIH requires CSF leak repair.

Recommended Diagnostic Pathway

Immediate steps:

  1. Detailed symptom assessment - Look for NPH triad components: gait disturbance (magnetic, shuffling), cognitive impairment (executive dysfunction, psychomotor slowing), urinary symptoms (urgency, frequency, incontinence) 3, 1

  2. MRI brain with contrast - Superior to CT for:

    • Confirming ventriculomegaly pattern
    • Assessing periventricular white matter changes
    • Evaluating for secondary causes (tumor, prior hemorrhage)
    • Excluding meningeal enhancement that would suggest SIH 5

  3. Predictive testing for shunt responsiveness:

    • Lumbar drain trial (72-hour external drainage with objective gait/cognitive testing) - Most reliable predictor
    • High-volume lumbar puncture (30-50 mL removal) with pre/post symptom assessment - Less invasive alternative 1

Treatment Algorithm

If positive response to CSF removal testing:

  • Ventriculoperitoneal shunt placement is the gold standard treatment 6, 1
  • Early intervention is critical—delayed treatment can result in irreversible deficits 1
  • Complete symptom resolution is possible with timely shunting, as demonstrated in cases with even atypical presentations including focal deficits 1

Shunt considerations:

  • Programmable valves allow post-operative pressure adjustments
  • 12-month revision rate approximately 13.6%, with infection being most common cause (43%) 6
  • Younger patients have higher revision risk 6

Common Pitfalls to Avoid

Do not dismiss atypical presentations: NPH can present with focal neurological deficits, aphasia, or mutism rather than the classic triad, potentially mimicking stroke or neurodegenerative disease 1. The acellular CSF helps exclude acute stroke-related processes.

Do not delay treatment pending "complete" workup: If clinical suspicion is high and predictive testing is positive, proceed to shunting. Delayed intervention can result in permanent disability even when the underlying pathophysiology is reversible 1.

Do not assume normal CSF pressure excludes the diagnosis: The term "normal pressure" is somewhat misleading—intermittent pressure elevations occur, and the diagnosis is clinical combined with imaging, not pressure-dependent 3.

Post-Treatment Expectations

Following successful shunt placement, expect gradual improvement over weeks. The patient in the most recent case series achieved complete functional recovery within 6 weeks 1. Multidisciplinary rehabilitation involving physical therapy for gait, occupational therapy for activities of daily living, and cognitive rehabilitation should be initiated early post-operatively, though evidence-based protocols remain limited 7.

References

5
Guideline

acr appropriateness criteria® imaging of suspected intracranial hypotension.

Journal of the American College of Radiology, 2024

7
Research

Rehabilitation after diagnosis of hydrocephalus in severe acquired brain injury: the unmet need for evidence-based guidelines.

Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology, 2026

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