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Nephrectomy for multicystic dysplastic kidney: if and when?

Elisa Ylinen1, Sirkku Ahonen, Marja Ala-Houhala

  • 1Hospital for Children and Adolescents, University of Helsinki, Helsinki, Finland.

Urology
|April 10, 2004
PubMed
Summary

Multicystic dysplastic kidney (MCDK) can often be managed conservatively, with involution occurring in about 25% of cases within 14 months. Surgery is recommended around age 2 if indicated, as involution is unlikely after 18 months.

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Area of Science:

  • Pediatric Nephrology
  • Urology
  • Developmental Biology

Background:

  • Multicystic dysplastic kidney (MCDK) is a common congenital anomaly.
  • Management strategies for MCDK vary, with ongoing debate regarding conservative versus surgical approaches.
  • Understanding the natural history and optimal timing for intervention is crucial for patient outcomes.

Purpose of the Study:

  • To evaluate criteria for conservative versus surgical treatment of multicystic dysplastic kidneys (MCDK).
  • To determine the optimal timing for surgical intervention in MCDK when indicated.
  • To assess the rate and timing of spontaneous involution in MCDK.

Main Methods:

  • A cohort of 48 patients with unilateral MCDK, detected antenatally or neonatally, was followed.

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  • Regular ultrasonography was used to monitor the affected renal mass.
  • Conservative management was the primary approach, with surgery considered after a minimum of 18 months if necessary.

    • Main Results:

    • Complete involution of the MCDK occurred in 13 cases (27%) within a mean follow-up of 46 months.
    • The renal mass persisted in 35 cases (73%), with 32 (67%) eventually undergoing nephrectomy.
    • Involution rates were significantly higher in cases that involuted completely (2.5 cm/yr) compared to those requiring surgery (0.6 cm/yr) up to 18 months; no significant involution occurred after 18 months.

    Conclusions:

    • Conservative management is a viable primary approach for antenatally or neonatally detected MCDK.
    • Spontaneous involution of MCDK typically occurs within 14 months, with minimal chance of significant involution after 18 months.
    • Surgical intervention for MCDK, if necessary, is recommended around 2 years of age, with rare occurrences of late complications like Wilms' tumor.