<prompt> Histological difference between ulcerative colitis and Crohns disease is presence of:-Crypt abscessDiffuse distribution of pseudopolypsMucosal edemaLymphoid aggregates in the mucosa  <response>: Among the given options Diffuse distribution of pseudo polyps- occurs in Ulcerative colitis Crohns Mucosal edema - occurs in both UCCD Lymphoid aggregates - occurs in both Crypt abscesses - Most characteristic lesion of UC Crypt abscess: Collection of neutrophils fill and expand the lumina of individual crypts of Lieberkuhn Crypt abscesses are not specific for UC and can be seen in Crohns disease . Crohns Disease Clinical Features - MC symptom is intermittent and colicky abdominal pain, most commonly noted in the lower abdomen. Diarrhea is the next most frequent symptom and is present, at least intermittently, in about 85 of patients.. Main intestinal complications of Crohns disease include obstruction and perforation. Fistulas occur between the sites of perforation and adjacent organs, usually at the site of a previous laparotomy. In Crohns disease, ileum is the MC site of fistula enterocutaneous and enterovesical, MC site of perforation and MC site of carcinoma. 