This is the gross appearance for multicystic renal dysplasia. Note the large but irregular cysts and the asymmetry of the kidneys. The small ureters lead to a hypoplastic bladder.

Multicystic renal dysplasia is a condition that results from the malformation of the kidney during fetal development. The kidney consists of irregular cysts of varying sizes. Multicystic dysplastic kidney is a common type of renal cystic disease, and it is a cause of an abdominal mass in infants.
When a diagnosis of multicystic kidney is made in utero by ultrasound, the disease is found to be bilateral in many cases. Those with bilateral disease often have other severe deformities or polysystemic malformation syndromes.

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