.in crohn&;s disease,Fibrosis, stricture formation, deep ulcers, oedema of mucosa between ulcer areas which looks like 'cobble stone', skipped normal areas in between, serosal opacity, mesen-teric fat stranding, enlarged mesenteric lymph nodes, abscesses in the mesentery, fistula are the pathology. Small mucosal aphthous ulcers are earliest gross feature. ref:SRB&;s manual of surgery,ed 3,pg no 800