Thickening of the colonic folders with Superimposed pseudomembranous colitis involving the right colon. Toxic megacolon is the clinical term for an acute toxic colitis with dilatation of the colon. The dilatation can be either total or segmental. A more contemporary term for toxic megacolon is simply toxic colitis, because patients may develop toxicity without megacolon. The hallmarks of toxic megacolon (toxic colitis), a potentially lethal condition, are nonobstructive colonic dilatation larger than 6 cm and signs of systemic toxicity. Toxic megacolon (toxic colitis) was recognized by Marshak and Lester in 1950.
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