This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Radiology
The PAIR technique can be used for treatment of the following stage of Liver hydatid cyst except? 
Select and explain. 
A. CE1, B. CE2, C. CE3, D. CE4
D: CE4
Answer: D: CE4 
Explanation: Ans DPercutaneous treatment of LHCs introduced in the mid-1980s has become an attractive alternative to surgery and medical management. It is used ideally in CE1 and CE3a. May be tried in CE2. However, it is never to be used in complicated hydatid cysts - CE4.