<prompt> All of the following extraintestinal manifestations of ulcerative colitis respond to colectomy exceptPrimary sclerosing cholangitisPyoderma gangrenosumEpiscleritisPeripheral ahralgia  <response>: .Treatment of Primary sclerosing cholangitis includes Stenting. T-tube drainage. Large dose steroids Immunosuppression therapy - methotrexate, azathioprine, tacrolimus, cyclosporine. Ursodeoxycholic acid is beneficial. Liver transplantation. ref:SRB ;s manual of surgery,ed 3,pg no- 590 