Corpus callosum atrophy in amyotrophic lateral sclerosis

Area of Science:

• Neuroscience
• Neurology
• Radiology

Background:

• Amyotrophic lateral sclerosis (ALS) is increasingly recognized to involve widespread cerebral pathology beyond the primary motor cortex.
• The corpus callosum, a crucial white matter tract, serves as a potential indicator of diffuse cerebral changes.

Purpose of the Study:

• To investigate corpus callosum atrophy as a measure of cerebral pathology in amyotrophic lateral sclerosis (ALS).
• To correlate corpus callosum atrophy patterns with cognitive and psychiatric symptoms in ALS patients.

Main Methods:

• Magnetic resonance imaging (MRI) was used to study 25 right-handed patients with sporadic ALS and 25 age- and sex-matched controls.
• Mid-sagittal corpus callosum areas were analyzed relative to the midline internal skull surface area on T1-weighted images.

Main Results:

• Patients with ALS exhibited a significantly decreased callosal/skull area ratio compared to controls.
• Atrophy showed an anterior predominance, with the anterior fourth of the corpus callosum severely affected in patients with cognitive or psychiatric symptoms.
• These findings suggest anterior corpus callosum atrophy is associated with cognitive decline and psychiatric manifestations in ALS.

Conclusions:

• Corpus callosum atrophy is a notable feature in amyotrophic lateral sclerosis (ALS).
• Anterior corpus callosum atrophy, especially in the anterior fourth, correlates with cognitive decline and psychiatric symptoms in ALS.
• This atrophy likely reflects widespread cerebral cortical pathology, particularly affecting the frontal cortex in ALS.