<prompt> Presence of islands of undifferentiated mesenchyme, often with cailage, and immature collecting ducts on light microscopy will be seen in which cystic disease of kidney?Medullary sponge kidneyAutosomal recessive polycystic kidney disease ARPKDAutosomal dominant polycystic kidney disease ADPKDMulticystic renal dysplasia  <response>: Multicystic renal dysplasia Sporadic disorder that can be unilateral or bilateral and is often cystic. The kidney is usually enlarged, extremely irregular, and multicystic. Although normal nephrons are present, many have immature collecting ducts. The characteristic histologic feature is the presence of islands of undifferentiated mesenchyme, often with cailage, and immature collecting ducts. 