<prompt> Which of the following are morphological features of childhood polycystic kidney disease?Enlarged kidney with smooth external surfaceDilated elongated channels present at right angle to the coical surfaceCysts are lined by cuboidal cellsAll of the above  <response>: Autosomal recessive polycystic kidney disease ARPKDChildhood polycystic kidney disease Kidneys - Enlarged, smooth external appearance. Cut section, numerous small cysts give kidney a sponge-like appearance. Dilated elongated channels are present at right angles to the coical surface, completely replacing the medulla and coex. ME - Cylindrical or, less commonly, saccular dilation of all collecting tubules. The cysts have a uniform lining of cuboidal cells. 