CT scan w/o contrast vs contrast

Hi I’m a patient that just underwent a CT with contrast (of the chest) I’ve also had a CT without contrast (also of the chest) in the past. My question is, what’s the main difference between the two as far as “insight” goes? and is one more dangerous than the other?

Side note: I have a very severe case of “pectus excavatum” (reason for CT’s) the first CT scan was before surgery and the second was taken after (scans are 8 months apart) I have the CD’s for both, if it’s of any interest, I can to take a screenshot of both scans and post them

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source https://www.reddit.com/r/Radiology/comments/hhcexo/ct_scan_wo_contrast_vs_contrast/

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