MedLink Neurology Podcast is delighted to feature selected episodes from BrainWaves, courtesy of James E Siegler MD, its originator and host. BrainWaves is an academic audio podcast whose mission is to educate medical providers through clinical cases and topical reviews in neurology, medicine, and the humanities, and episodes originally aired from 2016 to 2021.   Originally released: October 25, 2018   Every time you order an MRI with contrast, you should think to yourself, "Why do I need contrast?"   Then, "If I need contrast, what are the risks?" This week’s show is all about the risks of routine neuroimaging.   Produced by James E Siegler. Music by Little Glass Men, Loyalty Freak Music, and Kevin McLeod. Sound effects by Mike Koenig, Daniel Simion. BrainWaves' podcasts and online content are intended for medical education only and should not be used for clinical decision-making. Be sure to follow us on Twitter @brainwavesaudio for the latest updates to the podcast.   REFERENCES   McDonald RJ, McDonald JS, Kallmes DF, et al. Intracranial gadolinium deposition after contrast-enhanced MR imaging. Radiology 2015;275(3):772-82. PMID 25742194 Pullicino R, Radon M, Biswas S, Bhojak M, Das K. A review of the current evidence on gadolinium deposition in the brain. Clin Neuroradiol 2018;28(2):159-69. PMID 29523896 Rogosnitzky M, Branch S. Gadolinium-based contrast agent toxicity: a review of known and proposed mechanisms. Biometals 2016;29(3):365-76. PMID 27053146   We believe that the principles expressed or implied in the podcast remain valid, but certain details may be superseded by evolving knowledge since the episode’s original release date.