Which condition is classically characterized by a triad of gait disturbance, urinary incontinence, and cognitive impairment with ventriculomegaly on imaging?

Which condition is classically characterized by a triad of gait disturbance, urinary incontinence, and cognitive impairment with ventriculomegaly on imaging?

• A. Normal pressure hydrocephalus
• B. Alzheimer's disease
• C. Huntington disease
• D. Brain tumor

Answer: (A)

This pattern points to normal pressure hydrocephalus. The trio of gait disturbance, urinary incontinence, and cognitive impairment is classic for this condition, and imaging shows ventriculomegaly despite normal or only intermittently elevated CSF pressure. The gait change is often the earliest sign and is described as a magnetic or shuffling gait, reflecting disruption of frontal–subcortical circuits that control walking. As the condition progresses, cognitive changes emerge and urinary incontinence can appear, again tied to frontal lobe pathways. Imaging showing enlarged ventricles out of proportion to the cortical surface supports the diagnosis, with the underlying issue being impaired CSF absorption at the arachnoid granulations. Because the pressure readings are typically normal, this is termed “normal pressure” hydrocephalus, even though the ventricles are enlarged. A key point is that this syndrome can improve after CSF diversion, such as a shunt, and the gait often responds best to treatment. Other conditions don’t fit this exact combination. Alzheimer's disease mainly involves progressive memory loss with cortical atrophy rather than a prominent ventriculomegaly pattern. Huntington disease features chorea and caudate atrophy rather than the characteristic triad with enlarged ventricles. A brain tumor would present with focal neurologic signs and a mass lesion on imaging, not the diffuse ventricular enlargement with this specific symptom cluster.

This pattern points to normal pressure hydrocephalus. The trio of gait disturbance, urinary incontinence, and cognitive impairment is classic for this condition, and imaging shows ventriculomegaly despite normal or only intermittently elevated CSF pressure. The gait change is often the earliest sign and is described as a magnetic or shuffling gait, reflecting disruption of frontal–subcortical circuits that control walking. As the condition progresses, cognitive changes emerge and urinary incontinence can appear, again tied to frontal lobe pathways.

Imaging showing enlarged ventricles out of proportion to the cortical surface supports the diagnosis, with the underlying issue being impaired CSF absorption at the arachnoid granulations. Because the pressure readings are typically normal, this is termed “normal pressure” hydrocephalus, even though the ventricles are enlarged. A key point is that this syndrome can improve after CSF diversion, such as a shunt, and the gait often responds best to treatment.

Other conditions don’t fit this exact combination. Alzheimer's disease mainly involves progressive memory loss with cortical atrophy rather than a prominent ventriculomegaly pattern. Huntington disease features chorea and caudate atrophy rather than the characteristic triad with enlarged ventricles. A brain tumor would present with focal neurologic signs and a mass lesion on imaging, not the diffuse ventricular enlargement with this specific symptom cluster.