Acute necrotizing duodenitis in diabetic ketoacidosis.

Acute necrotizing esophagitis (ANE), acute necrotising duodenitis (AND), and Wishnesky's lesions (WLs) are three peculiar upper gastrointestinal pathologies that can be seen in death from diabetic ketoacidosis (DKA). Amongst these three, AND has only been recently described. Morphologically, ANE and AND present as generalized black discoloration of the intestinal tract, and florid necrosis and inflammation. Whereas WLs are discrete black lesions in the stomach with necrosis and muted inflammation. We report a case of isolated AND with an unusual morphology not previously reported. A man in his 60s was found dead at home who died from pneumonia complicated by DKA. The gastrointestinal tract showed isolated patchy and discrete AND in which macroscopically resembled WLs, but microscopy resembled ANE with florid necrosis and acute inflammation. This case, together with the literature, documented AND can be macroscopically diffuse or discrete resembling ANE or WLs respectively but microscopically resemble ANE. Furthermore, the potential of these lesions being found in isolation in DKA raises the possibility of both general and local mechanisms playing a role on their morphology and presentation.