I have heard so many interpretations of severe dysplasia/CIN III versus carcinoma in situ, I am reluctant to say if they are the same or if one is worse than the other. The internet has a plethora of information. Your doctor should also discuss with you exactly what is meant. In addition, rather than just schedule LEEP, find out if cold-knife cone biopy is better. It is critical to choose the best option for your condition.