Figure 912

Multicystic dysplastic kidney (MCDK) found incidentally by enhanced CT in a 34-year-old patient. The dysplastic kidney is composed of cysts with mural calcifications (arrows). Note the compensatory hypertrophy of the right kidney and the incidental simple cysts in it. MCDK consists of a collection of cysts frequently described as resembling a bunch of grapes and an atretic ureter. No function can be demonstrated. Only unilateral involvement is compatible with life. Usually, the contralateral kidney is normal and exhibits compensatory hypertrophy. In some 30% of cases, however, it is also affected by some congenital abnormalities such as dys-plasia or pelviureterical junction obstruction. In fact, among the many forms of renal dysplasia, MCDK is thought to represent a cystic variety.

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