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| ==Meckel diverticulum== | | ==Meckel diverticulum== |
| ===General===
| | {{Main|Meckel diverticulum}} |
| *Most common congenital anomaly of the gastrointestinal tract.<ref name=pmid15026601>{{Cite journal | last1 = Levy | first1 = AD. | last2 = Hobbs | first2 = CM. | title = From the archives of the AFIP. Meckel diverticulum: radiologic features with pathologic Correlation. | journal = Radiographics | volume = 24 | issue = 2 | pages = 565-87 | month = | year = | doi = 10.1148/rg.242035187 | PMID = 15026601 }}</ref>
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| **Remnant of the ''omphalomesenteric duct'' - a connection of the yolk sac and midgut.
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| The rule of 2s:
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| *2 feet from the terminal ileum
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| *2% of the population
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| *2% symptomatic.
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| *2 inches long.
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| *2 year old.
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| *2 types of epithelium - gastric and pancreatic.
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| Main clinical DDx of a symptomatic Meckel diverticulum:
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| *[[Appendicitis]].
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| ===Gross===
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| *Antimesenteric attachement, i.e. a ''Meckel's diverticulum'' hangs off the side opposite of the mesentery.
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| Image:
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| *[http://commons.wikimedia.org/wiki/File:Meckel%27s_Diverticulum_AFIP.jpg Meckel diverticulum - (AFIP/WC)].
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| ===Microscopic===
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| Features:<ref name=pmid15026601/>
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| *Small bowel mucosa.
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| *+/-Gastric mucosa:
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| **Foveolar epithelium: champagne flute-like columnar epithelium.
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| **Oxyntic mucosa: parietal cells (pink) and chief cells (purple).
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| *+/-Pancreatic epithelium:
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| **Pancreatic acini.
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| Images:
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| *[http://radiographics.rsna.org/content/24/2/565/F12.expansion.html Gastric foveolar epithelium in a MD (radiographics.rsna.org)].
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| *[http://radiographics.rsna.org/content/24/2/565/F15.expansion.html Gastric glands in a MD (radiographics.rsna.org)].
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| *[http://radiographics.rsna.org/content/24/2/565.long Pancreatic glands in a MD (radiographics.rsna.org)].
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| ==Ischemic enteritis== | | ==Ischemic enteritis== |