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Difference in CT w/ IV protocol?

Preparing a recent CT for 3D printing, I noticed that the lower pole of the left kidney did not enhance. Both scans were simple CT abdo/pelvis with IV, before and after endopyelotomy. If this is a difference in how they did the scan, how can I correct this when segmenting for 3D printing?

old and new scan

submitted by /u/Cordyanza
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source https://www.reddit.com/r/Radiology/comments/rolspl/difference_in_ct_w_iv_protocol/

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