Grunwald, DouglasMehta, ManishaSheth, Sunil2017-02-182016Grunwald, Douglas, Manisha Mehta, and Sunil G. Sheth. 2016. “Pseudomembranous Collagenous Colitis: A Case of Not-so-Microscopic Colitis.” ACG Case Reports Journal 3 (4): e187. doi:10.14309/crj.2016.160. http://dx.doi.org/10.14309/crj.2016.160.2326-3253http://nrs.harvard.edu/urn-3:HUL.InstRepos:30371060We present a 72-year-old male who developed progressive, watery diarrhea despite anti-motility agents. On colonoscopy, the mucosa was inflamed and covered with an exudate. Stool studies for Clostridium difficile and Escherichia coli were negative. Biopsies revealed pseudomembranous collagenous colitis, a rare form of microscopic colitis. His symptoms improved dramatically with budesonide therapy.en-USJournal Article2017-02-1810.14309/crj.2016.160