As @hopeful33250 said, there is nothing on the Mayo site about this but there is on the NCBI site -- https://www.ncbi.nlm.nih.gov/pubmed/22469806. It's pretty complex sounding for a layperson though.
NCBI is National Center for Biotechnology Information, and part of the National Institue of Health.

@thull Is tortuous colon related to IBS? I ask because I am trying to figure out now if I have IBS or a simple lactose intolerance. I seem to have days when I have scrupulously avoided dairy and still have a problem. It's not every day, but this sure is a nuisance.
JK