PMC2633324_01
Rectal mucosa (haematoxylin-eosin, x40) with a carcinoid within the muscularis mucosae, characterised by a proliferation of nests, glands and strands of non-atypical epithelial cells (A), which demonstrate expression of synaptophysin (B).
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F1
Small nests, glands and strands consisting of epithelial cells were present within the rectal muscularis mucosae (Figure 1).