Bilateral multicystic dysplastic kidney (MCDK) is a lethal form of multicystic dysplastic kidney (MCDK), a congenital anomaly of the kidney and urinary tract (CAKUT), in which both kidneys are large, distended by non-communicating multiple cysts and non-functional. The disease is MONDO_0019982 (bilateral multicystic dysplastic kidney). Also known as: bilateral MCDK, bilateral multicystic renal dysplasia.