Multicystic dysplastic kidney
 Discussion of Multicystic dysplastic kidney
- Multicystic dysplastic kidney is the second most common cause of an abdominal mass in the neonate, after hydronephrosis.
- Thought to be caused by severe ureteral obstruction early during gestation.
- Multicystic dysplastic kidney most often occurs unilaterally (bilateral is incompatible with life) and does not affect renal function unless the contralateral kidney has other associated anomalies.
- Common associated abnormalities include ureteropelvic junction obstruction (10%–20% of cases) or reflux nephropathy (30%–40%).
 Imaging Findings for Multicystic dysplastic kidney
- Mass of noncommunicating cysts of variable size.
- Unlike severe hydronephrosis, in which the largest cystic structure (the renal pelvis) lies in a central location and is surrounded by dilated calices, in multicystic dysplastic kidney the cyst distribution shows no recognizable pattern.
- Scant dysplastic, echogenic parenchyma may be visible between the cysts, but no normal renal parenchyma is seen.
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 References for Multicystic dysplastic kidney
- Maria-Gisela Mercado-Deane, James E. Beeson, and Susan D. John. US of Renal Insufficiency in Neonates. RadioGraphics 2002 22: 1429-1438.