True about ulcerative colitis are all except
20% end up in colectomy.
The highest risk of UC requiring surgery is in 1st year.
Extra intestinal problems of UC are managed medically
Steroid dependent cases needs surgery.
Ref. Sabiston Textbook of Surgery. Pg. 1340
Extraintestinal manifestations of ulcerative colitis respond to colectomy except Primary sclerosing cholangitis .