Multicystic dysplastic kidney (MCDK) is a condition where one kidney is formed of many cysts while the other is normal. It occurs in around 1 in 4000 newborns. In extremely rare cases, it can be bilateral, which leads to renal failure in infancy.
MCDK is normally diagnosed on antenatal ultrasound scans.
Usually, a single healthy kidney is sufficient to lead a normal life. Often, the cystic kidney will atrophy and disappear before 5 years of age. A single kidney increases the risk of hypertension and chronic kidney disease later in life.
No specific treatment is required for MCDK. Follow-up ultrasound scans may be recommended for monitoring.
Last updated March 2025
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