White matter involvement in idiopathic normal pressure hydrocephalus: a voxel-based diffusion tensor imaging study

Area of Science:

• Neuroimaging
• Neurology
• Radiology

Background:

• Idiopathic normal pressure hydrocephalus (INPH) is a neurological disorder characterized by gait disturbance, urinary incontinence, and cognitive impairment.
• White matter damage is implicated in INPH, but its specific characteristics and relationship to clinical symptoms require further elucidation.

Purpose of the Study:

• To characterize white matter damage in INPH using diffusion tensor imaging (DTI).
• To investigate the relationship between white matter microstructural changes and clinical presentation in INPH patients.

Main Methods:

• Diffusion tensor imaging (DTI) was performed on 20 INPH patients, 20 Alzheimer's disease patients, and 20 idiopathic Parkinson's disease patients.
• Mean diffusivity (MD) and fractional anisotropy (FA) were calculated and analyzed to compare groups and correlate with clinical measures.

Main Results:

• INPH patients exhibited higher mean diffusivity (MD) and lower fractional anisotropy (FA) in supratentorial white matter compared to controls.
• Lower FA in specific white matter regions (corpus callosum, subcortical areas) correlated with motor and cognitive deficits.
• Higher MD in periventricular regions was not associated with symptom severity.

Conclusions:

• DTI effectively reveals white matter abnormalities in INPH.
• Fractional anisotropy (FA) alterations in specific white matter tracts are associated with the motor and cognitive dysfunction observed in INPH.