<prompt> Carcinoma sigmoid colon with obstruction Management includesHamanns procedureResection and end to end anastomosis with proximal colostomyProximal colostomy with distal ligationSub-total colectomy  <response>: - Obstruction due to rectosigmoid growth with patient being severely ill--Hamanns operation can be done to save the life of the patient wherein distal stump after removal of the growth is closed, proximal colon is brought out as end colostomy.Resection of the gangrenous sigmoid done; proximal cut is brought out as end colostomy: distal end closed - Hamanns operation. Later in 6-12 weeks colorectal anastomosis is maintained. ref:SRB;s manual of surgery,ed 3,pg no 856 