Weill Cornell has a very specialized Cholesteotoma CAT scan, so I was told in late 2016. I had my CT done there. I live near The Hospital of the University of Pennsylvania (a top 20 hospital in America). My NYC Surgeon stated that UOP did not have the latest technology Weill Cornell had for Cholesteatomas. I did call UOP (sorry, I don't have my order any longer); my NYC Surgeon was correct. UOP did not offer the same level of CT Scan. For current advances, you may wish to read about Titanium PORP Implants (that is what I have, mine is a GRACE Medical device). This is the hearing bone prosthesis.
I had my 1st C-toma removed in 1998 (world-renowned Neurotologist, Dr. Mark Levenson - a GOD; I love him!). I had my last removed December 2016 (international expert Neurotologist, Dr. Samuel Selesnick); I don't think my procedures changed much over the years (although my 1997 surgery was FAR more extensive!).
When I do any research on Cholesteatomas I try to stick with the reputable sites. Not as well known, Dr. Mark Levenson's site is SUPERIOR, Johns Hopkins site (where I had my 2nd surgery, 2000), the .gov sites are generally good. I also trust Wikipedia. The otolaryngology associations are great sources of info. as well, both in America and internationally.
This question is difficult to respond to w/accuracy, as it is subject to change at any time .... following health news is wise. I do this.