<prompt> Toxic megacolon is seen inChronic non specific ulcerative colitiesCrohns diseaseColonic diveiculosisHamaomatous polyp  <response>: .Toxic megacolon 1.5 incidence Common in transverse colon Colon is more than 6 cm in diameter Colon is like wet blotting paper Commonly seen in ulcerative colitis Can occur in bacterial colitis, pseudomembranous colitis, fulminant amoebic colitis May be precipitated by antidiarrhoeal drugs Emergency surgery, colectomy, colostomyileostomy may be required IV fluids, blood transfusion, antibiotics, steroids are also needed Can be life threatening Plain X-ray is very useful. ref:SRBs manual of surgery,ed 5,pg no 895 