This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Cystic blood filled spaces of variable size in the liver lined by endothelial cells is know as: 
Select and explain. 
A. Peliosis hepatis, B. Hemangioma liver, C. Hepatic adenoma, D. Regenerative nodules
A: Peliosis hepatis
Answer: A: Peliosis hepatis 
Explanation: Peliosis hepatis is characterized by the presence of cystic, blood-filled spaces of variable size in the liver. Endothelial cells cover the internal surface of these cavities, and adjacent hepatocytes are normal. Ref: World J Gastroenterol 2006 June 14; 12(22): 3612-3615.