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toxic leukoencephalopathy
Toxic leukoencephalopathy or toxic spongiform leukoencephalopathy is a rare condition that is characterized by progressive damage (-pathy) to white matter (-leuko-) in the brain (-encephalo-), particularly myelin, due to causes such as exposure to drugs of abuse, environmental toxins, or chemotherapeutic drugs. The prevalence of this disease is infrequent and often goes unreported, especially in cases resulting from drug abuse. Magnetic resonance imaging (MRI) is a popular method to study and diagnose the disease. However, even with technological advances, the exact mechanism and underlying pathophysiology of toxic leukoencephalopathy remains unknown and is thought to vary between sources of toxicity. The clinical severity of toxic leukoencephalopathy also varies among patients, exposure time, and concentration and purity of the toxic agent. Some reversibility of the condition has been seen in many cases when the toxic agent is removed.
== Causes ==
Various pharmacological agents have been known to cause toxic leukoencephalopathy. The most common causes are substance abuse drugs and chemotherapy; however, the disease has also occurred on the rare occasion as a side effect to certain medications and environmental toxins.
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