Which ones commonly a/w crohn&;s disease

Chronic Crohn's: First stage--Mild diarrhoea, colicky pain, fever, anaemia, mass in right iliac fossa which is tender, firm, nonmobile along with recurrent perianal abscess. Second stage is either acute or chronic intestinal obstruction due to cicatrisation with narrowing. Third stage--Fistula formation--enterocolic, enteroenteric, entero-vesical, entero-cutaneous, etc. it is pre-cancerous condition but not as much as ulcerative colitis. ref:SRB&;s manual of surgery,ed 3,pg no 801