Heroin-induced leukoencephalopathy: characterization using MRI, diffusion-weighted imaging, and MR spectroscopy

Area of Science:

• Neurology
• Radiology
• Toxicology

Background:

• Heroin abuse can lead to a rare neurological condition known as heroin-induced leukoencephalopathy, also termed "chasing the dragon syndrome."
• Understanding the neuroimaging features is crucial for diagnosis and management.

Purpose of the Study:

• To characterize the magnetic resonance imaging (MRI) findings of heroin-induced leukoencephalopathy.
• Specifically, to detail the diffusion-weighted imaging (DWI) and MR spectroscopy (MRS) features of this condition.

Main Methods:

• Retrospective review of MRI examinations in six patients diagnosed with heroin-induced leukoencephalopathy.
• Inclusion of DWI and single-voxel MRS in the reviewed MRI studies.

Main Results:

• Consistent involvement of cerebellar white matter with symmetrical distribution and sparing of dentate nuclei in all cases.
• Brain stem and supratentorial white matter signal changes observed, correlating with corticospinal tract anatomy.
• MRS revealed reduced N-acetylaspartate and choline, with elevated lactate in affected areas; DWI showed no signal restriction.

Conclusions:

• Heroin-induced leukoencephalopathy presents with characteristic and specific MRI signal abnormalities.
• DWI and MRS findings align with known neuropathology, aiding in understanding disease mechanisms and supporting treatment strategies.