• Dejan Samardzic and Krishnamoorthy Thamburaj.
• Department of Radiology, Penn State Milton S Hershey Medical Center, Penn State College of Medicine, Hershey, PA, 17033.
• J Neuroimaging. 2015 Jan 1;25(1):136-9.

Background And PurposeTo report the brain imaging features on magnetic resonance imaging (MRI) in inadvertent intrathecal gadolinium administration.MethodsA 67-year-old female with gadolinium encephalopathy from inadvertent high dose intrathecal gadolinium administration during an epidural steroid injection was studied with multisequence 3T MRI.ResultsT1-weighted imaging shows pseudo-T2 appearance with diffusion of gadolinium into the brain parenchyma, olivary bodies, and membranous labyrinth. Nulling of cerebrospinal fluid (CSF) signal is absent on fluid attenuation recovery (FLAIR). Susceptibility-weighted imaging (SWI) demonstrates features similar to subarachnoid hemorrhage. CT may demonstrate a pseudo-cerebral edema pattern given the high attenuation characteristics of gadolinium.ConclusionIntrathecal gadolinium demonstrates characteristic imaging features on MRI of the brain and may mimic subarachnoid hemorrhage on susceptibility-weighted imaging. Identifying high dose gadolinium within the CSF spaces on MRI is essential to avoid diagnostic and therapeutic errors.Copyright © 2013 by the American Society of Neuroimaging.

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