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During the current opioid epidemic, the number of children with illicit toxic ingestions is increasing. Children presenting with altered mental status and neurologic, particularly cerebellar symptoms of unclear etiology, should be considered to undergo brain imaging as well as toxicology screening to not miss the possible complication of acute toxic leukoencephalopathy. We report the case of an eight-year-old child who presented with somnolence and respiratory depression of unclear etiology, responding profoundly to naloxone, quickly raising concern for drug ingestion. The toxicology screen was positive for fentanyl, cocaine metabolites, caffeine, and diphenhydramine, but not available until day 3 of the hospital stay. In the interim, head CT and brain MRI findings revealed concerning bilateral cerebellar hypodensities, suggestive of opioid-induced leukoencephalopathy. This condition has been described as potentially malignant and fatal, but very few cases of this pathology have been described in children so far. Fortunately, all neurological symptoms in our patient, including altered mental status, respiratory depression, atactic gait, blurry vision, and lower extremity pain, completely resolved within five days of presentation and the patient seemingly underwent a full clinical recovery without residual symptoms. Awareness and prompt recognition of acute toxic leukoencephalopathy in children presenting with altered mental status or neurological symptoms of unclear etiology is of utmost importance to prevent deterioration and optimize treatment, especially during times of a worsening opioid epidemic in our country., Competing Interests: Human subjects: Consent was obtained or waived by all participants in this study. Conflicts of interest: In compliance with the ICMJE uniform disclosure form, all authors declare the following: Payment/services info: All authors have declared that no financial support was received from any organization for the submitted work. Financial relationships: All authors have declared that they have no financial relationships at present or within the previous three years with any organizations that might have an interest in the submitted work. Other relationships: All authors have declared that there are no other relationships or activities that could appear to have influenced the submitted work., (Copyright © 2024, Gale et al.)