Mesenchymal Tumors

Jun 22, 2016 by in GASTROENTEROLOGY Comments Off on Mesenchymal Tumors

Mesenchymal Tumors General Comments Gastrointestinal (GI) spindle cell tumors caused diagnostic confusion for decades. Previously, most were diagnosed as either smooth muscle or neural tumors. However, following decades of ultrastructural…

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Gastrointestinal Neuroendocrine Lesions

Jun 22, 2016 by in GASTROENTEROLOGY Comments Off on Gastrointestinal Neuroendocrine Lesions

Gastrointestinal Neuroendocrine Lesions General Organization of the Gastrointestinal System The gastrointestinal neuroendocrine system (GNES) is the largest and most complex endocrine organ in the body (1). The gut contains numerous…

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Neoplastic Lesions of the Anus

Jun 22, 2016 by in GASTROENTEROLOGY Comments Off on Neoplastic Lesions of the Anus

Neoplastic Lesions of the Anus General Comments Anal tumors are predominantly squamous in nature, and while they are rare, they have shown an increase in recent years due to the…

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The Nonneoplastic Anus

Jun 22, 2016 by in GASTROENTEROLOGY Comments Off on The Nonneoplastic Anus

The Nonneoplastic Anus Embryology The anal canal develops from the distal hindgut. Early in development, the hindgut, allantois, and urogenital tracts end in a common cloaca. Later, the urogenital septum…

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Adenocarcinoma

Jun 22, 2016 by in GASTROENTEROLOGY Comments Off on Adenocarcinoma

Adenocarcinoma Incidence and Death Rates The highest incidence rates for colon cancer occur in North America, Australia, and New Zealand, as discussed previously in this chapter. The risk for colorectal…

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Evaluation of Resection Specimens

Jun 22, 2016 by in GASTROENTEROLOGY Comments Off on Evaluation of Resection Specimens

Evaluation of Resection Specimens General Comments The unopened bowel should be carefully examined upon receipt from the operating room, then opened and pinned to a corkboard for fixation in 10%…

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Secondary Tumors

Jun 22, 2016 by in GASTROENTEROLOGY Comments Off on Secondary Tumors

Secondary Tumors The large bowel may be the site of metastasis or extension from a number of tumors. It may also be involved by direct invasion or extension, intraperitoneal seeding,…

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Adenomas

Jun 22, 2016 by in GASTROENTEROLOGY Comments Off on Adenomas

Adenomas Adenomas, the benign glandular neoplasms that precede colon cancer development, originate from the intestinal epithelium. They occur singly or multiply. When multiple, the patients may have a genetic syndrome…

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