Junctional parenchymal defect is most commonly seen in the ______ kidney?

Junctional parenchymal defect is most commonly seen in the ______ kidney?

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

Answer: (D)

Junctional parenchymal defect is a benign anatomic variant in the renal cortex at the corticomedullary junction. It appears on ultrasound as a triangular or wedge-shaped area within the renal parenchyma and is not associated with impaired function or inflammatory disease. This defect is reported most commonly in the right kidney, though the exact developmental reason isn’t fully established. The key point is that it is a normal variant, so when you see a wedge-shaped, well-circumscribed echogenic band at the corticomedullary junction on the right, it should be interpreted as junctional parenchymal defect rather than a scar or inflammatory process. Correlate with normal renal function and absence of clinical infection or hydronephrosis to avoid misdiagnosis.

Junctional parenchymal defect is a benign anatomic variant in the renal cortex at the corticomedullary junction. It appears on ultrasound as a triangular or wedge-shaped area within the renal parenchyma and is not associated with impaired function or inflammatory disease. This defect is reported most commonly in the right kidney, though the exact developmental reason isn’t fully established. The key point is that it is a normal variant, so when you see a wedge-shaped, well-circumscribed echogenic band at the corticomedullary junction on the right, it should be interpreted as junctional parenchymal defect rather than a scar or inflammatory process. Correlate with normal renal function and absence of clinical infection or hydronephrosis to avoid misdiagnosis.