Figure 6.

Dromedary hump, hypertrophied column of Bertin, and persistent fetal lobulation. A: Ultrasound showing an external bulge on the lateral border of the left kidney, reported as a possible nodule. B: CT confirmed a renal lobulation (dromedary hump). C: Sagittal ultrasound showing a mass-like area in the left kidney. D: Coronal contrast-enhanced T1-weighted MRI showing enhancement similar to that of the adjacent normal renal cortex, an aspect consistent with hypertrophied column of Bertin. E: Ultrasound showing an external bulge on the right kidney, misinterpreted as a renal nodule. F: Contrast-enhanced coronal T1-weighted MRI showing lobulated contours, consistent with persistent fetal lobulation. Note the normal parenchymal thickness and normal appearance of the renal collecting system, features that are helpful in differentiation this from scarring.