Which renal pathology is described by small, shrunken kidneys with increased echogenicity and compensatory contralateral hypertrophy?

Which renal pathology is described by small, shrunken kidneys with increased echogenicity and compensatory contralateral hypertrophy?

• A. Acute Pyelonephritis
• B. Chronic Glomerulonephritis
• C. Malakoplakia
• D. Emphysematous Pyelonephritis

Answer: (B)

Chronic renal parenchymal disease produces small, echogenic kidneys because long-standing inflammation scarred the tissue and reduced overall nephron mass. That fibrosis makes the kidneys appear brighter on ultrasound and leaves the normal contour and architecture distorted. When one kidney is more affected, the other often enlarges to compensate, leading to compensatory contralateral hypertrophy. This combination of small, bright kidneys with a larger opposite kidney is a classic ultrasound pattern for chronic glomerulonephritis. Acute pyelonephritis typically shows enlarged kidneys with edema and changes in the corticomedullary junction, not shrunk, highly echogenic kidneys. Malakoplakia can cause irregular renal appearances but doesn’t classically present as shrunken kidneys with contralateral hypertrophy. Emphysematous pyelonephritis presents with gas within the parenchyma and distinct reverberation artifacts, not the described shrinking and contralateral hypertrophy pattern.

Chronic renal parenchymal disease produces small, echogenic kidneys because long-standing inflammation scarred the tissue and reduced overall nephron mass. That fibrosis makes the kidneys appear brighter on ultrasound and leaves the normal contour and architecture distorted. When one kidney is more affected, the other often enlarges to compensate, leading to compensatory contralateral hypertrophy. This combination of small, bright kidneys with a larger opposite kidney is a classic ultrasound pattern for chronic glomerulonephritis.

Acute pyelonephritis typically shows enlarged kidneys with edema and changes in the corticomedullary junction, not shrunk, highly echogenic kidneys. Malakoplakia can cause irregular renal appearances but doesn’t classically present as shrunken kidneys with contralateral hypertrophy. Emphysematous pyelonephritis presents with gas within the parenchyma and distinct reverberation artifacts, not the described shrinking and contralateral hypertrophy pattern.