Transcranial sonography in brain disorders with trace metal accumulation

Area of Science:

• Neuroimaging
• Neurology
• Trace Element Metabolism

Background:

• Conventional MRI has limitations in detecting subtle trace metal accumulation in deep brain structures.
• Trace metal dysregulation is implicated in various neurodegenerative and movement disorders.

Purpose of the Study:

• To evaluate the utility of Transcranial Sonography (TCS) in detecting trace metal accumulation in deep brain structures.
• To assess the potential of TCS in identifying individuals at risk for neurological diseases associated with metal dysregulation.

Main Methods:

• Application of Transcranial Sonography (TCS) to visualize deep brain structures.
• Comparison of TCS findings with conventional MRI results in subjects with known or suspected trace metal-related neurological conditions.

Main Results:

• TCS demonstrated higher sensitivity than MRI in detecting increased iron in the substantia nigra (Parkinson's disease).
• TCS identified elevated copper in the lenticular nucleus (LN) in Wilson's disease and idiopathic dystonia.
• TCS detected increased manganese in the LN in manganese-induced Parkinsonism, even with normal MRI.

Conclusions:

• TCS is a sensitive tool for detecting trace metal accumulation (iron, copper, manganese) in deep brain structures.
• TCS may aid in identifying individuals with an increased risk of developing neurological symptoms, particularly relatives of patients with Parkinson's or Wilson's disease.
• Further research is needed to elucidate the precise mechanisms linking elevated trace metal content to increased echogenicity observed with TCS.