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My son had an MRI with gadolinium- turns out he is allergic to it, he developed a full-body itchy rash. There were like 20 interns in to see him, for the experience I guess. They were ready to send him to the ER in case it interfered with his breathing, luckily it didn't.

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That would have been frightening. Did it require treatment beyond antihistamine?

I’ve given MR contrast to patients a lot of times (probably tens of thousands) and have seen hives and rashes a handful of times but vastly more often with iodinated contrast in X-ray procedures (usually CT).

This happened to me with iodinated CT contrast

Every square inch of my body was hives for 2 weeks

My kidney function was abnormal for 2 weeks as well and later I was like urinating out goop

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