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Multicystic dysplastic kidneys: spontaneous regression demonstrated with US
Radiology
|October 1, 1986
Summary
Multicystic dysplastic kidney (MCDK) can spontaneously regress in neonates, often appearing as unilateral renal agenesis on later ultrasounds. Serial ultrasound assessment supports a conservative, non-surgical approach for MCDK management.
Area of Science:
- Pediatric Nephrology
- Medical Imaging
- Urology
Background:
- Multicystic dysplastic kidney (MCDK) is a common congenital anomaly.
- The natural history and potential for regression of MCDK are not fully understood.
- Previous management often involved surgical intervention.
Purpose of the Study:
- To investigate the spontaneous regression of multicystic dysplastic kidney (MCDK) in neonates.
- To evaluate the role of serial ultrasound (US) in assessing MCDK changes.
- To inform management strategies for neonates with MCDK.
Main Methods:
- Retrospective analysis of nine neonates diagnosed with MCDK.
- Serial ultrasound examinations from in utero or postnatal diagnosis through 32 weeks postpartum.
- Surgical exploration in three cases for further assessment.
Main Results:
- Spontaneous regression or complete disappearance of MCDK was observed in all nine neonates.
- In three cases, MCDK diagnosed in utero appeared as unilateral renal agenesis postnatally.
- Serial US demonstrated significant size reduction or complete resolution of MCDK.
- Surgical exploration confirmed absence of kidney/ureter in two, and a small MCDK in one.
Conclusions:
- Ultrasound reveals that MCDK can undergo spontaneous regression, mimicking renal agenesis.
- Given the rarity of malignant transformation and the potential for regression, a conservative, non-surgical approach is recommended.
- A 1-year observation period with serial US is advised before considering surgical intervention for MCDK, unless other complications arise.