Which renal pathology is associated with UPJ obstruction?

Which renal pathology is associated with UPJ obstruction?

• A. ARPKD
• B. ADPKD
• C. MCKD
• D. Medullary Sponge Kidney

Answer: (C)

UPJ obstruction occurs at the junction where the renal pelvis meets the ureter, so conditions that distort the collecting system or cause medullary architectural changes can influence the likelihood of obstruction at that point. Medullary Cystic Kidney Disease involves cystic and fibrotic changes in the medullary collecting ducts and surrounding tubulointerstitial tissue. These changes can disrupt normal urine drainage and contribute to impaired outflow at the UPJ, making an association with UPJ obstruction more likely than the other options, which describe diseases that either affect the kidney more globally (like ARPKD or ADPKD) or involve collecting ducts in a different pattern (Medullary Sponge Kidney) without the same tendency to produce UPJ obstruction.

UPJ obstruction occurs at the junction where the renal pelvis meets the ureter, so conditions that distort the collecting system or cause medullary architectural changes can influence the likelihood of obstruction at that point.

Medullary Cystic Kidney Disease involves cystic and fibrotic changes in the medullary collecting ducts and surrounding tubulointerstitial tissue. These changes can disrupt normal urine drainage and contribute to impaired outflow at the UPJ, making an association with UPJ obstruction more likely than the other options, which describe diseases that either affect the kidney more globally (like ARPKD or ADPKD) or involve collecting ducts in a different pattern (Medullary Sponge Kidney) without the same tendency to produce UPJ obstruction.