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[A simple renal cyst]

M Yasuda1, M Masai, J Shimazaki

  • 1Department of Urology, School of Medicine, Chiba University.

Nihon Hinyokika Gakkai Zasshi. the Japanese Journal of Urology
|February 1, 1993
PubMed
Summary
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Simple renal cysts are common, affecting 14% of patients. Most cases are asymptomatic and do not impact kidney function or become malignant, suggesting routine follow-up is adequate.

Area of Science:

  • Nephrology
  • Radiology
  • Urology

Context:

  • Simple renal cysts are frequently detected during routine ultrasound examinations.
  • Understanding the clinical features and natural history of these cysts is crucial for patient management.

Purpose:

  • To determine the incidence and clinical characteristics of simple renal cysts.
  • To evaluate the natural course, including growth rate and potential complications, of simple renal cysts over time.

Summary:

  • A study of 30,316 patients found a 14% incidence of simple renal cysts, with a male-to-female ratio of 1.6:1.
  • The number and size of cysts increased with age, particularly after the fifth decade.
  • Most cysts (75.3%) were asymptomatic; microhematuria and proteinuria were observed but not correlated with cyst size. Renal function remained unaffected, and no malignant tumors developed during follow-up.

Related Experiment Videos

  • Cyst punctures with sclerosing agents were ineffective in reducing cyst size.

    • Impact:

    • Routine follow-up is deemed sufficient for asymptomatic simple renal cysts due to their slow growth and lack of association with renal dysfunction or malignancy.
    • This study provides evidence-based recommendations for managing simple renal cysts, potentially reducing unnecessary interventions.