What causes Dromedary hump in kidney on imaging?
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Answer:
Dromedary hump is a prominent focal bulge on the lateral border of the left kidney due to impression from the adjacent spleen, representing a normal anatomic variant that may mimic a renal mass or pseudotumor; it exhibits identical imaging characteristics to adjacent renal cortex across modalities including ultrasound, CT, MRI, and nuclear medicine, with normal calyceal extension into the bulge and normal radiotracer uptake on Tc-99m DMSA scan.
Why is it called so?:
Named after the prominent single hump on the back of a dromedary camel, reflecting the similar focal bulge on the lateral contour of the left kidney.
Pathophysiology:
The bulge develops embryologically from molding and adaptation of the superolateral left renal cortex by chronic pressure from the adjacent spleen during renal development and growth.
Alternative names: Splenic hump
Other associated named signs: Columns of Bertin
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