Dromedary hump most commonly affects the ______ kidney?

Dromedary hump most commonly affects the ______ kidney?

• A. Right
• B. Left
• C. Both
• D. Neither

Answer: (B)

A dromedary hump is a normal variant in the contour of the kidney. It appears as a focal bulge along the lateral border of the left kidney because the spleen sits against and shapes that side of the kidney. This splenic influence makes the left kidney more prone to developing the hump, which is why it’s seen there more often than on the right. To distinguish it from a mass, look for a smooth, continuous cortical outline with the same echogenicity as the rest of the kidney and no disruption of the internal architecture or calyces. There is no separate lesion or irregular capsule. Since the splenic contact is not present on the right side, this feature is far less common there and not typically seen on both kidneys. The left kidney is the one most commonly affected.

A dromedary hump is a normal variant in the contour of the kidney. It appears as a focal bulge along the lateral border of the left kidney because the spleen sits against and shapes that side of the kidney. This splenic influence makes the left kidney more prone to developing the hump, which is why it’s seen there more often than on the right.

To distinguish it from a mass, look for a smooth, continuous cortical outline with the same echogenicity as the rest of the kidney and no disruption of the internal architecture or calyces. There is no separate lesion or irregular capsule. Since the splenic contact is not present on the right side, this feature is far less common there and not typically seen on both kidneys. The left kidney is the one most commonly affected.