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Table 1: 
Clinical presentation in patients with AS
SymptomsAcute Onset*Subacute Onset†Chronic Onset‡
Headache541
Gait disturbance016
Memory disturbance016
Incontinence015
Seizure020
  • Note:—AS indicates aqueductal stenosis.
  • * Duration between symptoms and radiologic examination <1 month.
  • † Duration between 1 and 6 months.
  • ‡ Chronic onset: duration >6 months. Numbers refer to patients in each category.