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Acquired renal cystic disease in the end stage kidney: urological implications
Insights
Acquired renal cystic disease, common in end-stage renal failure patients, has significant urological implications, including an increased risk of renal tumors. Regular screening via imaging is crucial for early detection and management.
Area of Science:
- Nephrology
- Urology
- Radiology
Background:
- Acquired renal cystic disease (ARCD) is frequently observed in end-stage renal disease (ESRD) patients.
- The pathogenesis of ARCD remains unclear, with potential links to tubular obstruction, ischemia, or toxic product accumulation.
Observation:
- ARCD presents as bilateral, multiple small cysts in contracted kidneys, detectable by ultrasound or CT.
- While often asymptomatic, ARCD can be associated with hemorrhage or neoplasia.
Findings:
- Autopsy studies indicate renal tumors in up to 45% of ARCD patients.
- Tumors are typically small, but larger renal cell carcinomas and metastatic disease have been reported.
Implications:
- Patients with chronic renal failure require periodic native kidney surveillance using imaging modalities.
- Distinguishing benign from malignant lesions radiologically can be challenging, potentially necessitating nephrectomy for uncertain diagnoses.
Abstract:
A unique form of acquired renal cystic disease occurs commonly in the end stage kidneys of patients with chronic renal failure. Recent experience with 3 cases of acquired renal cystic disease has made us aware that the condition has significant urological implications. The pathogenesis of this disease is unknown but may be related to tubular obstruction, ischemia or the accumulation of toxic products. The diagnosis of acquired renal cystic disease is established by either ultrasound or computerized tomography, both of which demonstrate bilateral multiple small cysts scattered throughout the cortex and medulla of the contracted end stage kidney. Acquired renal cystic disease usually is asymptomatic but may be associated with either hemorrhage or neoplasia. Autopsy studies have revealed renal tumors in up to 45 per cent of the patients with acquired renal cystic disease. These tumors usually are small but our case 3 was a renal cell carcinoma that measured 4 cm. in diameter. Also, there have been other recent reports of large tumors and deaths of metastatic renal carcinoma in patients with acquired renal cystic disease. Patients with chronic renal failure should undergo periodic examination of the native kidneys by either ultrasound or computerized tomography. It may be difficult to distinguish benign from malignant lesions radiologically, and nephrectomy may be indicated when the diagnosis is uncertain.