We present a case of opioid-associated amnestic syndrome (OAS) in a 46-year-old female with persistent acute anterograde amnesia and biochemically confirmed with fentanyl use. The brain Magnetic Resonance Imaging (MRI) examination demonstrated symmetric restricted diffusion and T2/fluid-attenuated inversion recovery (FLAIR) hyperintensities in the hippocampi and cerebellum. While cases of cerebellar findings in OAS are rare in the literature, this is a unique case with corresponding images that demonstrate cerebellar involvement in addition to the more common hippocampal finding.
Keywords: anterograde amnesia; cerebellar restricted diffusion; fentanyl-associated toxic encephalopathy; hippocampal restricted diffusion; oas; opioid-associated amnestic syndrome; opioid-induced amnesia.
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