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The Value of Morphological Neuroimaging after Acute Exposure to Toxic Substances

  • Review Article
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Toxicological Reviews

Abstract

Many toxic agents induce brain dysfunction and/or lesions. Modern neuroimaging techniques, such as CT and more recently magnetic resonance imaging (MRI), are able to demonstrate toxic brain lesions at both early and delayed phases of disease progression. In the early phase, neuroimaging enables the detection of acutely injured brain areas responsible for sudden onset of neurological dysfunction, but the severity and the extension of brain lesions on neuroimages do not necessarily parallel the severity of the clinical status. In the chronic phase, when neurological dysfunction has become permanent, neuroimaging allows precise identification of neuroanatomical sequelae that do not necessarily match the severity of the chronic neurological impairment. Papers in the medical imaging literature have dealt mainly with the brain changes induced by ‘chronic exposure’ to toxic substances such as solvents or heavy metals. This article selectively reviews the main radiological changes observed on CT/magnetic resonance (MR) neuroimages after ‘acute exposure’ to industrial products (methanol [methyl alcohol], ethylene glycol), environmental agents (cyanide, carbon monoxide), pharmaceuticals (insulin, valproic acid) and illicit substances (heroin, cocaine). Different kinds of lesions, which lack specificity for toxic injury, can be observed on radiological images, but deep grey matter lesions with symmetrical distribution throughout basal ganglia are most often seen. However, such findings have also been reported after anoxic-ischaemic insults or during severe metabolic disturbances. Lesions in the white matter may also be present in the case of acute exposure to toxic agents. The true prognostic value of toxic-induced brain changes in the acute phase in CT or MR studies is unclear, although serial MRI may add new information as may quantitative or molecular imaging techniques such as the MR diffusion-weighted imaging or MR spectroscopy.

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No sources of funding were used for the preparation of this review. The authors have no conflicts of interest that are directly relevant to the contents of the review.

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  1. Department of Intensive Care, Cliniques St-Luc, Université catholique de Louvain, Avenue Hippocrate, 10, 1200, Brussels, Belgium

    Philippe Hantson

  2. Department of Radiology and Medical Imaging, Cliniques St-Luc, Université catholique de Louvain, Brussels, Belgium

    Thierry Duprez

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Hantson, P., Duprez, T. The Value of Morphological Neuroimaging after Acute Exposure to Toxic Substances. Toxicol Rev 25, 87–98 (2006). https://doi.org/10.2165/00139709-200625020-00003

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