A renal contour abnormality resulting from enlargement of the renal column projecting into the pyramids is called?

• A. Hypertrophied column of Bertin
• B. Dromedary hump
• C. Junctional parenchymal defect
• D. Papilla

Answer: (A)

The main idea is that the renal columns (columns of Bertin) are extensions of cortex that separate the renal pyramids. When these columns enlarge, they project further into the pyramids, creating a contour change called a hypertrophied column of Bertin. This is a benign anatomic variant, not a mass or pathology, and it explains a renal contour that appears expanded or lobulated where the columns intrude into the medullary pyramids.

This best fits because the description specifically describes enlargement of the renal column projecting into the pyramids. Other options refer to different normal variants or structures: a dromedary hump is a lateral cortical bulge on the outer kidney border, not an intrusion into the pyramids; a junctional parenchymal defect is a triangular area at the cortex–medulla junction from developmental variation; and a papilla is just the tip of a pyramid, not a contour abnormality caused by column enlargement.