IPLab:Lab 5:Polycystic Kidney Disease

Clinical Summary

This 64-year-old white man had a history of hypertension, adult-onset diabetes, gouty arthritis, chronic obstructive pulmonary disease (COPD), chronic anemia, bleeding from colonic polyps, and bleeding from gastric ulcers. The patient was in end-stage renal failure due to polycystic kidney disease and he required renal dialysis. His mother and a brother both died from renal complications.

His terminal admission was for congestive heart failure and ventricular tachycardia. He underwent a coronary artery bypass grafting (CABG) operation after which he was ventilator-dependent. Two days after the operation he developed pneumonia and died.

Autopsy Findings

The lungs were diffusely consolidated with some abscesses in the right upper lobe. The kidneys were markedly enlarged. The right kidney weighed 1660 grams and the left kidney weighted 1780 grams.

Images

• 

  This is a gross photograph of the kidneys from this case. Note that both kidneys contain multiple large cysts (arrows).

• 

  This is a gross photograph of one of the kidneys from this case next to a normal kidney. This photograph demonstrates how big these polycystic kidneys are compared to a normal kidney.

• 

  This is a gross photograph of a cut section from one of these polycystic kidneys. Note that the renal parenchyma is almost completely replaced by cystic structures.

• 

  This is a low-power photomicrograph of an H&E-stained section from this polycystic kidney. Note the large cystic structures (1), the few residual glomeruli (2), and the fibrous connective tissue throughout this section.

• 

  This is another low-power photomicrograph of an H&E-stained section from this polycystic kidney. Again note the large cystic structures (arrows)and the fibrous connective tissue throughout this section.

• 

  This is a higher-power photomicrograph of polycystic kidney showing the edge of a large cyst (1). In this section there are numerous tubules and dilated collecting ducts (2) that are filled with the same red proteinaceous material as the larger cysts.

• 

  This high-power photomicrograph shows abnormal glomeruli (arrows) and some tubules.

• 

  This is a gross photograph of the liver from this patient. Multiple cysts can be seen on the surface of this liver (arrows).

• 

  This photomicrograph of liver demonstrates the histologic appearance of these cysts.

• 

  This is another photomicrograph of liver demonstrating the histologic appearance of these cysts. These cystic structures are associated with the biliary tree.

• 

  This is a higher-power photomicrograph of liver cyst. These cystic structures are lined by biliary epithelium.

Study Questions

• What are the inheritance pattern and incidence of adult polycystic kidney disease?

Autosomal dominant.

Adult polycystic kidney disease occurs in approximately 1 out of 1000 people. A rare autosomal recessive polycystic kidney disease occurs in childhood (perinatal, infantile, neonatal, and juvenile subcategories) but this anomaly is genetically distinct from the adult variety.

• What is the significance of history of hypertension and uremic pericarditis in this patient?

People with polycystic kidney disease often develop hypertension, as do many patients with renal disease. Uremic pericarditis often occurs in people with kidney failure induced uremia.

• What are some of the other congenital anomalies that can be seen in people with polycystic kidney disease?

Asymptomatic polycystic liver disease is seen in 40% of these patients. Cysts can also occur, albeit infrequently, in the spleen, pancreas and lungs. These people also have a 10% to 30% incidence of berry aneurysms in the circle of Willis.