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4. Crohn’s disease: Difference between revisions

4. Crohn’s disease (view source)

Revision as of 13:14, 7 July 2024

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(Created page with "'''Staining''': HE '''Organ''': Large intestine '''Description''': Many histological findings are important in Crohn’s. Not all of them can be found on this slide: An aphthous ulcer, which is a knifelike deep ulcer, is present. Non-caseating granulomas are visible throughout the whole thickness of the wall. These contain giant cells. Plasma cells, lymphocytes and eosinophils are abundant throughout the whole thickness of the wall. Cryptal distortion, where the c...")
 
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'''Staining''': HE
[[File:Crohn disease - overview.png|thumb|Overview. Granulomas are found throughout the thickness of the wall.|376x376px]]'''Staining''': HE


'''Organ''': Large intestine
'''Organ''': Large intestine
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An aphthous ulcer, which is a knifelike deep ulcer, is present.
An aphthous ulcer, which is a knifelike deep ulcer, is present.


Non-caseating granulomas are visible throughout the whole thickness of the wall. These contain giant cells.
Non-caseating granulomas are visible throughout the whole thickness of the wall. These contain giant cells.[[File:Crohn disease - lymphocytes.png|thumb|Lymphocytes and plasma cells infiltrate the whole thickness of the wall (the whole thickness isn’t pictured here)|325x325px]]Plasma cells, lymphocytes and eosinophils are abundant throughout the whole thickness of the wall.
 
Plasma cells, lymphocytes and eosinophils are abundant throughout the whole thickness of the wall.


Cryptal distortion, where the crypts lose their normal round shape and instead take on an irregular shape is present.
Cryptal distortion, where the crypts lose their normal round shape and instead take on an irregular shape is present.
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Cryptal abscess, where neutrophils are present in the lumen of the crypts, is present.
Cryptal abscess, where neutrophils are present in the lumen of the crypts, is present.


Paneth cell metaplasia, where Paneth cells are not normally present (the left colon), is present. If Crohn’s affects a part of the colon where Paneth cells are normally present (the right colon), there will be Paneth cell hyperplasia. Paneth cells have large eosinophilic granules that make their cytoplasm look reddish. Look for reddish parts on the bottom of crypts.
Paneth cell metaplasia, where Paneth cells are not normally present (the left colon), is present. If Crohn’s affects a part of the colon where Paneth cells are normally present (the right colon), there will be Paneth cell hyperplasia. Paneth cells have large eosinophilic granules that make their cytoplasm look reddish. Look for reddish parts on the bottom of crypts.[[File:Crohn disease - cryptal distortion.png|thumb|Cryptal distortion|280x280px]]Pseudopyloric metaplasia, where the colonic crypts become more like pyloric glands, is probably not present on the slide.
 
Pseudopyloric metaplasia, where the colonic crypts become more like pyloric glands, is probably not present on the slide.


'''Diagnosis''': Crohn’s disease
'''Diagnosis''': Crohn’s disease
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The crypts are distorted because they are repeatedly destroyed and regenerated due to inflammation.
The crypts are distorted because they are repeatedly destroyed and regenerated due to inflammation.
[[File:Crohn disease - overview.png|center|thumb|Overview. Granulomas are found throughout the thickness of the wall.]]
[[File:Crohn disease - granulomas.png|thumb|Granulomas|left]]
[[File:Crohn disease - lymphocytes.png|center|thumb|Lymphocytes and plasma cells infiltrate the whole thickness of the wall (the whole thickness isn’t pictured here)]]
[[File:Crohn disease - giant cells.png|thumb|Giant cells]]
[[File:Crohn disease - cryptal distortion.png|center|thumb|Cryptal distortion]]
[[File:Crohn disease - eosinophils.png|thumb|Eosinophils|left]]
[[File:Crohn disease - granulomas.png|center|thumb|Granulomas]]
[[File:Crohn disease - cryptitis.jpg|thumb|Neutrophils in the walls of the crypts = cryptitis. This picture is NOT from our slide, it’s from <nowiki>https://librepathology.org/wiki/Cryptitis</nowiki>. I could not find evidence of cryptitis on the slide, however our teacher said that there should be. Maybe you’ll find it.]]
[[File:Crohn disease - giant cells.png|center|thumb|Giant cells]]
[[File:Crohn disease - cryptal abscess.png|thumb|Neutrophils in the lumen of the crypts = cryptal abscess|left]]
[[File:Crohn disease - eosinophils.png|center|thumb|Eosinophils]]
[[File:Crohn disease - Paneth cell metaplasia.png|thumb|Paneth cell metaplasia|left]]
[[File:Crohn disease - cryptitis.jpg|center|thumb|Neutrophils in the walls of the crypts = cryptitis. This picture is NOT from our slide, it’s from <nowiki>https://librepathology.org/wiki/Cryptitis</nowiki>. I could not find evidence of cryptitis on the slide, however our teacher said that there should be. Maybe you’ll find it.]]
[[File:Crohn disease - cryptal abscess.png|center|thumb|Neutrophils in the lumen of the crypts = cryptal abscess]]
[[File:Crohn disease - Paneth cell metaplasia.png|center|thumb|Paneth cell metaplasia]]
[[Category:Pathology 2 - Histopathology slides]]
[[Category:Pathology 2 - Histopathology slides]]