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Gross lesions will include a focal area of abdominal distention with or without haemorrhage. The wall of the intestines at the site of blockage may be thinner than that of the adjacent intestine due to continuous peristaltic movements at the site of blockage. In rare cases, intestinal perforation may be seen. Microscopic lesions may include ulceration, necrosis and thinning of the muscular layers at the site of blockage. In longstanding blockages there will be marked attenuation of villi and granulation tissue.
 
Gross lesions will include a focal area of abdominal distention with or without haemorrhage. The wall of the intestines at the site of blockage may be thinner than that of the adjacent intestine due to continuous peristaltic movements at the site of blockage. In rare cases, intestinal perforation may be seen. Microscopic lesions may include ulceration, necrosis and thinning of the muscular layers at the site of blockage. In longstanding blockages there will be marked attenuation of villi and granulation tissue.
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'''Neoplasia'''
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The most common form of GI tract neoplasia is lymphosarcoma. The lymphoblastic form of lymphosarcoma is the most common for in the intestine.
 
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