Leukoencephalopathy in HTLV-I-associated myelopathy: MRI and EEG data

Area of Science:

• Neurology
• Neuroimmunology
• Infectious Diseases

Background:

• Human T-lymphotropic virus type I (HTLV-I) infection can lead to a chronic neurological disorder known as HTLV-I-associated myelopathy (HAM).
• The extent of central nervous system (CNS) involvement in HAM, beyond the spinal cord, is not fully understood.

Purpose of the Study:

• To investigate the prevalence and characteristics of brain abnormalities in patients with HAM using Magnetic Resonance Imaging (MRI) and Electroencephalography (EEG).
• To correlate neuroimaging and electrophysiological findings with disease duration and disability in HAM patients.

Main Methods:

• Brain MRI (T2-weighted images) and EEG were performed on 22 patients diagnosed with HAM.
• Neuroimaging findings, including white matter lesions, were analyzed.
• EEG results were assessed for abnormalities.
• Correlation analysis was conducted between MRI/EEG findings, disease duration, and disability scores.

Main Results:

• Eighty-six percent (19/22) of HAM patients showed abnormalities on brain MRI and/or EEG.
• Thirteen patients exhibited high signal intensity lesions in the cerebral white matter on T2-weighted MRI, predominantly in subcortical and deep regions.
• Patients with MRI abnormalities had longer disease duration and greater disability.
• EEG revealed definite abnormalities in 9 patients and minor abnormalities in 5.
• All patients with HAM for over 5 years demonstrated definite cerebral involvement.

Conclusions:

• Brain MRI and EEG findings suggest that a multifocal pathological process affecting the entire CNS is common in HAM.
• These results highlight the systemic neurological impact of HTLV-I infection.
• Cerebral involvement appears to increase with disease duration in HAM patients.