Multicystic dysplastic kidney (MCDK) is a condition that results from the malformation of the kidney during fetal development. The kidney consists of irregular cysts of varying sizes and has no function. Multicystic dysplastic kidney is the most common type of renal cystic disease, and it is one of the most common causes of an abdominal mass in infant. When a diagnosis of multicystic kidney is made in utero by ultrasound, the disease is found to be bilateral in 19% to 34% of cases. Those with bilateral disease often have other severe deformities or polysystemic malformation syndromes. In bilateral cases, the newborn has the classic abnormal facies and oligohydramnios characteristic of Potter's syndrome. The bilateral condition is incompatible with survival, although one infant reportedly survived for 69 days.
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