This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Polycystic Kidney Disease, Subject name: Pathology
Which of the following are morphological features of childhood polycystic kidney disease? 
Select and explain. 
A. Enlarged kidney with smooth external surface, B. Dilated elongated channels present at right angle to the coical surface, C. Cysts are lined by cuboidal cells, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Autosomal recessive polycystic kidney disease (ARPKD)/Childhood 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. M/E - Cylindrical or, less commonly, saccular dilation of all collecting tubules. The cysts have a uniform lining of cuboidal cells.