Inadvertent split-bolus trauma CT: test your renal injury detection

This portal venous phase CT after a motor vehicle collision shows an unintentional split-bolus appearance from prior contrast in the collecting systems. Inspect the kidneys and collecting systems closely—can you spot the abnormality? The full explanation is coming in the next vi…

• Residual contrast from a prior scan created an inadvertent split-bolus appearance, mimicking a dedicated urographic technique on this trauma CT.
• The teaching point is to scrutinize the opacified collecting systems and renal parenchyma for traumatic injury, a key skill for on-call radiology trainees.
• This case-based challenge reinforces pattern recognition for renal and collecting system trauma in the setting of altered contrast dynamics.

Automated summary

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