Carcinoid tumor, incidental
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MICROSCOPIC FEATURES
• Nests of cells with neuroendocrine features (polygonal cells with round nuclei with “salt-and-pepper” chromatin and no nucleoli)
• The cytoplasm is eosinophilic or amphophilic, and may contain granules
• The cells are monomorphic, and mitoses are rare
• The stroma is usually delicate and vascular but can become dense and fibrous
• May form tubules or acini, with PAS-positive luminal material