When the large intestine was opened, it was noticed that the mucosa of the entire colon is lined with a gray-white-yellowish thick membrane, occasionally coarse in appearance, adhering to the mucosa at the level of the transverse and descending colon and rectum, detachable at the level of the cecum and of the ascending colon; the underlying mucosa was thickened, shiny, pink-white, with numerous yellowish dots arranged difusely.
https://www.researchgate.net/publication/265787532_Pseudomembranous_colitis_complicating_the_natural_course_of_Crohns_disease_in_a_pediatric_patient 
