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*+/-Reactive epithelial changes - may mimic dysplasia.<ref name=pmid11175639/> | *+/-Reactive epithelial changes - may mimic dysplasia.<ref name=pmid11175639/> | ||
Notes: | |||
*Pseudomembranes arise from the crypts - considered ''acute''. | *Pseudomembranes arise from the crypts - considered ''acute''. | ||
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**[[NSAID]] overdose.<ref name=pmid11736840>{{Cite journal | last1 = Appu | first1 = S. | last2 = Thompson | first2 = G. | title = Gangrenous ischaemic colitis following non-steroidal anti-inflammatory drug overdose. | journal = ANZ J Surg | volume = 71 | issue = 11 | pages = 694-5 | month = Nov | year = 2001 | doi = | PMID = 11736840 }}</ref> | **[[NSAID]] overdose.<ref name=pmid11736840>{{Cite journal | last1 = Appu | first1 = S. | last2 = Thompson | first2 = G. | title = Gangrenous ischaemic colitis following non-steroidal anti-inflammatory drug overdose. | journal = ANZ J Surg | volume = 71 | issue = 11 | pages = 694-5 | month = Nov | year = 2001 | doi = | PMID = 11736840 }}</ref> | ||
*[[Infectious colitis]]. | *[[Infectious colitis]]. | ||
===Ischemia versus infection on biopsy=== | |||
Dignan and Greenson<ref name=pmid9199649>{{Cite journal | last1 = Dignan | first1 = CR. | last2 = Greenson | first2 = JK. | title = Can ischemic colitis be differentiated from C difficile colitis in biopsy specimens? | journal = Am J Surg Pathol | volume = 21 | issue = 6 | pages = 706-10 | month = Jun | year = 1997 | doi = | PMID = 9199649 }}</ref> created a tabular comparison between ischemia and (''C. difficile'') infection. | |||
A modified version of the Dignan-Greenson table (below) shows that the two etiologies generally cannot be separated; however, hyalinization appears to be useful if it is present: | |||
{| class="wikitable sortable" | |||
! Histologic feature | |||
!Ischemia (24 cases) | |||
!Infection (25 cases) | |||
|- | |||
| Atrophic crypts | |||
| 75% | |||
| 24% | |||
|- | |||
| Lamina propria - haemorrhage | |||
| 75% | |||
| 36% | |||
|- | |||
| Lamina propria - hyalinization | |||
| 67% | |||
| 0% | |||
|- | |||
| Diffuse (histologic) pseudomembranes | |||
| 25% | |||
| 4% | |||
|- | |||
| Mucosal necrosis (full thickness) | |||
| 58% | |||
| 28% | |||
|} | |||
===Images=== | ===Images=== | ||
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www: | www: | ||
*[http://www.flickr.com/photos/euthman/3385570758/ Ischemic colitis (flickr.com/euthman)]. | *[http://www.flickr.com/photos/euthman/3385570758/ Ischemic colitis (flickr.com/euthman)]. | ||
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