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General
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Terminology
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Clinical features
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Gross images
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Large tumor with hemorrhage and degeneration

Invasion of large vessel



Tumor is well demarcated from surrounding parenchyma

Micro images
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Trabecular and nesting patterns

Tumor cells have salt and pepper chromatin



Organoid pattern characterized by nests and sheets



Serotonin+

Gastric carcinoid in MEN1

Positive stains
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Negative stains
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Electron microscopy images
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ECL-type vesicular granules (left) and solid granules (right)
with cerebroid punctate structure

End of Pancreas > Neuroendocrine neoplasms > NET G1 / Carcinoid tumors



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