Table 2.

Histopathologic severity of pseudomembranous colitis

Classification	Description of changes
Type 1	Mildest form, most of the changes are limited only to the superficial epithelium. Pseudomembranous changes are present, but ulcers are found only occasionally
Type 2	More evident changes in the colonic mucosa, gland disorders and significantly increased amount of secreted mucus. Inflammation that invades the basement membrane
Type 3	Full thickness necrosis is noticed within the whole bowel wall with pseudomembranous changes